THE OFFSPRING OF SCIENCE 



evolution as far back through the lower animals 

 as human faculties would permit. It was 

 palaeontology, embryology, comparative physiol- 

 ogy, and histology that became the most convinc- 

 ing witnesses for the mechanical origin and 

 development of organisms. In the Neanderthal 

 man, the Spy man, the Krapina man, and the 

 Pithecanthropus of Trinil, palaeontology supplied 

 one by one the missing links between man, the. 

 anthropoid apes, and their primitive common an- 

 cestor. At the same time, it gathered the proofs 

 of the existence of similar types in the Tertiary 

 age. Haeckel formulated his biogenetic law, 

 which revealed the fact that individual develop- 

 ment is a condensed repetition of the race devel- 

 opment, and that the embryos and newborn 

 individuals resemble their ancestral types more 

 closely than the adult parents. Then came 

 Behring with his discovery that blood serum of 

 horses treated with poison of diphtheria bacilli 

 was an antidote and preventive of diphtheria, 

 and Uhlenhuth found that blood transfusion fur- 

 nished an infallible test for the close or remote 

 relationship of animals. Uhlenhuth, Wasser- 

 mann, Stern, Friedenthal, and Nuttall continued 

 these experiments and proved the blood relation- 

 ship of man and the anthropoid apes. 



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