If we now plainly perceive that the passage of the blood from the arteries into the veins of the tadpole is not performed in any other than those vessels, which are so minute as only to admit the passage of… — Antonie van Leeuwenhoek Copy Share
If any person examines by the microscope that part towards the extremity of the spider's body from whence its thread proceeds, he will observe… — Antonie van Leeuwenhoek Copy Share Image
In rain water, I observed a small red worm and two other kinds of very minute insects; of those of the larger size, I… — Antonie van Leeuwenhoek Copy Share Image
I have often endeavoured to view the circulation of the blood in terrestrial animals, but without success, by reason that no parts of their… — Antonie van Leeuwenhoek Copy Share Image
In treating of the oak, I have considered that the species of it growing in warm climates is superior to that which is produced… — Antonie van Leeuwenhoek Copy Share Image
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… — Antonie van Leeuwenhoek Copy Share
Whenever I found something remarkable, I have thought it my duty to put down my discovery on paper, so that all ingenious people be… — Antonie van Leeuwenhoek Copy Share Image
Man comes not from an egg but from an animalcule that is found in male sperm. — Antonie van Leeuwenhoek Copy Share Image
I've spent more time than many will believe [making microscopic observations], but I've done them with joy, and I've taken no notice those who… — Antonie van Leeuwenhoek Copy Share Image
I have divers times endeavoured to see and to know, what parts the Blood consists of; and at length I have observ'd, taking some… — Antonie van Leeuwenhoek Copy Share Image
Whenever I found out anything remarkable, I have thought it my duty to put down my discovery on paper, so that all ingenious people… — Antonie van Leeuwenhoek Copy Share Image
The 4th sort of creatures... which moved through the 3 former sorts, were incredibly small, and so small in my eye that I judged, that if 100 of them lay [stretched out] one by another, they would not equal the length of a grain of course Sand; and according to this estimate, ten hundred thousand of them could not equal… — Antonie van Leeuwenhoek Copy Share
How inscrutable and incomprehensible are the hidden works of Nature! — Antonie van Leeuwenhoek Copy Share Image
![“I've spent more time than many will believe [making microscopic observations], but I've done them with joy, and I've taken no notice those who have said why take so much trouble and what good is it?” quote by Antonie van Leeuwenhoek](https://sms4smile.com/quotes/img-quotes/5b8/antonie-van-leeuwenhoek-17943_believe_i-ve-spent-more-time-than-many-will-beli_560375.jpg)
