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POPULAR SCIENCE MONTHLY 



Fig. 7. K. Eunst Von Baer at about Seventy Years of Age. 



aspect of the field in which they work and all later growth is influenced 

 by their lahors." 



The greatest classic in embryology is his ' Entwickelungsgeschichte 

 der Tiere — Beobachtung unci Reflexion,' the first part of which was 

 published in 1828, and the work on the second part completed in 1834, 

 although it was not published till 1837. This second part was never 

 finished according to the plan of Von Baer, but was issued by his pub- 

 lisher, after vainly wailing for the finished manuscript. The final 

 portion, which Von Baer had withheld, in order to perfect in some 

 particulars, was published in 1888, after his death, but in the form in 

 which he had left it in 1834. 



