Io6 BIOLOGY AND ITS MAKERS 



entangled therein, extending their body in a long round, and 

 striving to dis-en tangle their tayle; whereby it came to pass, 

 that their whole body lept back towards the globule of the 

 taylc, which then rolled together serpent-like, and after the 

 manner of copper or iron wire, that having been wound 

 around a stick, and unwound again, retains those v/indings 

 and turnings," etc.* 



Any one who has examined under the microscope the well- 

 known bell -animalcule will recognize in this first description 

 of it, the stalk, and its form after contraction under the desig- 

 nation of a 'tayle which retains those windings and turnings.' 



There are many other descriptions, but the one given is 

 typical of the others. He found the little animals in water, 

 in infusions of pepper, and other vegetable substances, and 

 on that account they came soon to be designated infusoria. 

 His observations were not at first accompanied by sketches, 

 but in 1 71 1 he sent some drawings with further descriptions. 



0. Fr. Muller. — These animalcula became favorite ob- 

 jects of microscopic study. Descriptions began to accu- 

 mulate and drawings to be made until it became evident that 

 there were many different kinds. It was, however, more 

 than one hundred years after their discovery byLeeuwenhoek 

 that the first standard work devoted exclusively to these 

 animalcula was published. This treatise by O. Fr. Muller 

 was published in 1786 under the title of Animalcida Injtisoria, 

 The circumstance that tliis volume of quarto size had 367 

 pages of description v.ith 50 plates of sketches will gi\'e som^e 

 indication of the number of protozoa known at that time. 



Ehrenberg. — Observations in this domain kept accu- 

 mulating, but the next publication necessary to mention is that 

 of Ehrenberg (i 795-1876). This scientific traveler and 

 eminent observer was the author of several works. He was 



* Kent's Manual of the Infusoria, Vol. I, p. 3. Quotation from the 

 Philosophical Transactions for the year 1677. 



