“I have divers times examined the same matter (human semen) from a healthy man... not from a sick man... nor spoiled by keeping... for a long time and not liquefied after the lapse of some time... but immediately after ejaculation before six beats of the pulse had intervened; and I have seen so great a number of living animalcules... in it, that sometimes more than a thousand were moving about in an amount of material the size of a grain of sand... I saw this vast number of animalcules not all through the semen, but only in the liquid matter adhering to the thicker part.” MenHumansLongSometimesMatterMovingScienceNumbersSawsMaterialsAmountHealthyThousandSixLong TimeBeatsSickSizeSandGrainPulseLiquidSpoiledMicroscopesLapsesGrains Of SandSick ManEjaculation Author:Antonie van Leeuwenhoek
“I observed certain animalcules, within whole bodies I saw so quick a motion as to exceed belief; they were about the size of a large grain of sand, and their bodies being transparent, that the internal motion could plainly be seen. Among other things, I saw in the body of one of these animalcules a bright and round corpuscle, placed near the head, and in which a very wonderful swift motion was to be seen, consisting of an alternate extension and contraction. This particle I concluded to be the heart.” HeartWholeBodyCertainBeliefSawsWonderfulRoundsSizeSandInternalsGrainExtensionsParticlesTransparentExceedGrains Of SandContractions Author:Antonie van Leeuwenhoek
“The 31th of May, I perceived in the same water more of those Animals, as also some that were somewhat bigger. And I imagine, that [ten hundred thousand] of these little Creatures do not equal an ordinary grain of Sand in bigness: And comparing them with a Cheese-mite (which may be seen to move with the naked eye) I make the proportion of one of these small Water-creatures to a Cheese-mite, to be like that of a Bee to a Horse: For, the circumference of one of these little Animals in water, is not so big as the thickness of a hair in a Cheese-mite.” MayLittlesBigsEyeMovingScienceWaterAnimalImagineHairThousandTenCreaturesEqualOrdinaryHundredBiggerHorseNakedCompareProportionSandImagine ThatGrainBeesCheeseGrains Of SandNaked EyesThickness Author:Antonie van Leeuwenhoek
