With the short title Micographia: Or Some Physiological Descriptions of Minute Bodies Made With Magnifying Glasses With Observations and Inquiries Thereupon - catchy, I know - the book was authored by famed scientist Robert Hooke. Want to get your hands on it?! Well, good news. The book is now available on Google Books for you to read for free.
As you flip (or scroll) through the book, you'll find wonderful drawings of everything from fleas through bark to the edges of razors. For all you microscope and science junkies out there, it's exciting to see what constituted cutting-edge scientific understanding in 1665! If you're interested, read Carl Zimmer's review to learn more.