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“The trade of chemist (fortified, in my case, by the experience of Auschwitz), teaches you to overcome, indeed to ignore, certain revulsions that are neither necessary or congenital: matter is matter, neither noble nor vile, infinitely transformable, and its proximate origin is of no importance whatsoever. Nitrogen is nitrogen, it passes miraculously from the air into plants, from these into animals, and from animals into us; when its function in our body is exhausted, we eliminate it, but it still remains nitrogen, aseptic, innocent.”

“Junk turns the user into a plant. Plants do not feel pain since pain has no function in a stationary organism. Junk is a pain killer. A plant has no libido in the human or animal sense. Junk replaces the sex drive. Seeding is the sex of the plant and the function of opium is to delay seeding. Perhaps the intense discomfort of withdrawal is the transition from plant back to animal, from a painless, sexless, timeless state back to sex and pain and time, from death back to life.”

“The same polarity of the male and female principle exists in nature; not only, as is obvious in animals and plants, but in the polarity of the two fundamental functions, that of receiving and penetrating. It is the polarity of earth and rain, of the river and the ocean, of night and day, of darkness and light, of matter and spirit.”

“Men swagger around calling themselves "cattlemen" but abuse their grass like a rapist. And abuse their cattle with concrete fecal feedlots without any regards to rumen function. Vegetable growers plow thousands of acres, planting monocrops of annuals in a never-ending tillage routine that totally annihilates carbon wealth. Why? Why are we so enamored of things that destroy carbon and disrespect the animals under our care? Grass. Lowly grass. It just gets no respect. And yet it is the lifeblood of the planet.”

“To wade in marshes and sea margins is the destiny of certain bird, and they are so accurately made for this that they are imprisoned in those places. Each animal out of its habitat would starve. To the physician, each man, each woman, is an amplification of one organ. A soldier, a locksmith, a bank-clerk, and a dancer could not exchange functions. And thus we are victims of adaptation.”

“The virtue of a faculty is related to the special function which that faculty performs. Now there are three elements in the soul which control action and the attainment of truth: namely, Sensation, Intellect, and Desire. Of these, Sensation never originates action, as is shown by the fact that animals have sensation but are not capable of action.”

“Once women invented farming, and began to keep and breed animals, they discovered the crucial function of the rooster and the henhouse. Fathers suddenly gained a function, and could do what only women had been able to do for all those millions of years--point at a child and say, "That is my son," "That is my daughter." Patriarchy quickly followed, beginning about five thousand years ago; a very short time in the development of our species, but covering all of recorded history.”

“When in many dissections, carried out as opportunity offered upon living animals, I first addressed my mind to seeing how I could discover the function and offices of the heart's movement in animals through the use of my own eyes instead of through the books and writings of others, I kept finding the matter so truly hard and beset with difficulties that I all but thought, with Fracastoro, that the heart's movement had been understood by God alone.”

“The average man is what his environment and his superstitions have made him; and their function is to make him an ass. He can't add up three or four new circumstances together and perceive what they mean; it is beyond him. He is not capable of observing for himself; he has to get everything at second-hand. If what are miscalled the lower animals were as silly as man is, they would all perish from the earth in a year.”

“If you see cattle as a source of organic manure, animal energy, as well as milk products, then Indian cattle are not inferior. It is only when you measure them as milk machines that they become inferior. What if we measured the dairy cows of America or Jersey or the Swiss Alps in terms of their work functions? They would be terribly inferior.”

“Man cannot survive except through his mind. He comes on earth unarmed. His brain is his only weapon. Animals obtain food by force. man had no claws, no fangs, no horns, no great strength of muscle. He must plant his food or hunt it. To plant, he needs a process of thought. To hunt, he needs weapons,and to make weapons - a process of thought. From this simplest necessity to the highest religious abstraction, from the wheel to the skyscraper, everything we are and we have comes from a single attribute of man -the function of his reasoning mind.”

“Human beings are so destructive. I sometimes think we're a kind of plague, that will scrub the earth clean. We destroy things so well that I sometimes think, maybe that's our function. Maybe every few eons, some animal comes along that kills off the rest of the world, clears the decks, and lets evolution proceed to its next phase.”

“No occupation is more worthy of an intelligent and enlightened mind, than the study of Nature and natural objects; and whether we labour to investigate the structure and function of the human system, whether we direct our attention to the classification and habits of the animal kingdom, or prosecute our researches in the more pleasing and varied field of vegetable life, we shall constantly find some new object to attract our attention, some fresh beauties to excite our imagination, and some previously undiscovered source of gratification and delight.”

“In the animal world, on the other hand, the process of evolution is characterised by the progressive discrimination of the animal and vegetative functions, and a consequent differentiation of these two great provinces into their separate departments.”

“The chemical differences among various species and genera of animals and plants are certainly as significant for the history of their origins as the differences in form. If we could define clearly the differences in molecular constitution and functions of different kinds of organisms, there would be possible a more illuminating and deeper understanding of question of the evolutionary reactions of organisms than could ever be expected from morphological considerations.”

“The melting pot failed to function in one crucial area. Religions and nationalities, however different, generally learned to live together, even to grow together, in America. But color was something else. Reds were murdered like wild animals. Yellows were characterized as a peril and incarcerated en masse during World War ii for no really good reason by our most liberal president. Browns have been abused as the new slave labor on farms. The blacks, who did not come here willingly, are now, more than a century after emancipation by Lincoln, still suffering a host of slave like inequalities.”

“It is true, says Liebeg, that thousands have lived without a knowledge of tea and coffee; and daily experience teaches us that, under certain circumstances, they may be dispensed with without disadvantage to the merely animal functions, but it is an error, certainly, to conclude from this that they may be altogether dispensed with in reference to their effects; and It is a question whether, if we had no tea and no coffee, the popular instinct would not seek for and discover the means of replacing them.”

“All living organisms are but leaves on the same tree of life. The various functions of plants and animals and their specialized organs are manifestations of the same living matter. This adapts itself to different jobs and circumstances, but operates on the same basic principles. Muscle contraction is only one of these adaptations. In principle it would not matter whether we studied nerve, kidney or muscle to understand the basic principles of life. In practice, however, it matters a great deal.”

“A man, even if seriously sick or prevented in the exercise of its higher functions, is and will be always a man ... [he] will never become a 'vegetable' or an 'animal,'" the Pope said. "The intrinsic value and personal dignity of every human being does not change depending on their circumstances.”

“Why it is that animals, instead of developing in a simple and straightforward way, undergo in the course of their growth a series of complicated changes, during which they often acquire organs which have no function, and which, after remaining visible for a short time, disappear without leaving a trace ... To the Darwinian, the explanation of such facts is obvious. The stage when the tadpole breathes by gills is a repetition of the stage when the ancestors of the frog had not advanced in the scale of development beyond a fish.”

“The laws of Coexistence;-the adaptation of structure to function; and to a certain extent the elucidation of natural affinities may be legitimately founded upon the examination of fully developed species;-But to obtain an insight into the laws of development,-the signification or bedeutung, of the parts of an animal body demands a patient examination of the successive stages of their development, in every group of Animals.”

“An immune system of enormous complexity is present in all vertebrate animals. When we place a population of lymphocytes from such an animal in appropriate tissue culture fluid, and when we add an antigen, the lymphocytes will produce specific antibody molecules, in the absense of any nerve cells. I find it astonishing that the immune system embodies a degree of complexity which suggests some more or less superficial though striking analogies with human language, and that this cognitive system has evolved and functions without assistance of the brain.”

“I consider the differences between man and animals in propensities, feelings, and intellectual faculties, to be the result of the same cause as that which we assign for the variations in other functions, viz. difference of organization; and that the superiority of man in rational endowments is not greater than the more exquisite, complicated, and perfectly developed structure of his brain, and particularly of his ample cerebral hemispheres, to which the rest of the animal kingdom offers no parallel, nor even any near approximation, is sufficient to account for.”

“Plants, again, inasmuch as they are without locomotion, present no great variety in their heterogeneous pacts. For, when the functions are but few, few also are the organs required to effect them. ... Animals, however, that not only live but perceive, present a great multiformity of pacts, and this diversity is greater in some animals than in others, being most varied in those to whose share has fallen not mere life but life of high degree. Now such an animal is man.”

“That which is useless dies. Animals that fail to serve some useful purpose in the scheme of things slowly but surely become extinct. Let any part of the human body cease to perform its ordained function, and it withers-as when an arm is kept long in a sling. This same decree, that nothing useless is permitted to survive, runs through the mind of the industrial world.”

“Whoever would not remain in complete ignorance of the resources which cause him to act; whoever would seize, at a single philosophical glance, the nature of man and animals, and their relations to external objects; whoever would establish, on the intellectual and moral functions, a solid doctrine of mental diseases, of the general and governing influence of the brain in the states of health and disease, should know, that it is indispensable, that the study of the organization of the brain should march side by side with that of its functions.”