There was discover’d by me a fifth sort, which had near the thickness of the former, but they were almost twice as long. The first time bacteria were observed.
ANTONIE VAN LEEUWENHOEK
This particle I concluded to be the heart.
![Antonie van Leeuwenhoek Quote - 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?](https://minimalistquotes.com/wp-content/uploads/2021/10/ive-spent-more-time-than-many-will-believe-making--683x1024.jpg)
![Antonie van Leeuwenhoek Quote - The whole circumference of each of these streaks was about the thickness of a hair of one’s head. … all consisted of very small green globules joined together: and there were very many small green globules as well. [The earliest recorded observation of the common green alga Spyrogyra.]](https://minimalistquotes.com/wp-content/uploads/2022/09/the-whole-circumference-of-each-of-these-streaks-w-683x1024.jpg)
![Antonie van Leeuwenhoek Quote - 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.](https://minimalistquotes.com/wp-content/uploads/2022/09/the-4th-sort-of-creatures-which-moved-through-the--683x1024.jpg)
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