MIRACLES OF SCIENCE 



vious how similar tests with other types of anti-sera 

 enable the experimenter to follow out the relation- 

 ships of different tribes of animals. 



Professor Nuttall's experiments comprised sixteen 

 thousand individual tests, with a total of at least 586 

 species mammals, birds, reptiles, batrachian, fishes, 

 crustaceans coming from all parts of the globe. 

 These experiments are in themselves highly inter- 

 esting; in their implications they are nothing less 

 than astounding. 



Doubtless some hundreds of thousands of years 

 have elapsed since the direct ancestors of men 

 branched from a common stem with the direct ances- 

 tors of the gorilla. There has been no blending of 

 blood in the intervening centuries. Cats have been 

 cats and dogs dogs from geological epochs so remote 

 that we hesitate to guess their span in terms of years. 

 So the intimate chemical qualties that denote man 

 or ape or cat or dog, each in contradistinction to all 

 the others, must have been transmitted unmodified 

 through countless thousands of generations. 



It taxes credulity to believe that such intangible 

 properties could be transmitted unmodified, through 

 the blood streams of such myriads of individuals ; but 

 the evidence of the test-tubes proves that this has 

 been done. 



What makes the marvel greater is the fact that the 

 bodies of the animals have meantime been so modi- 

 fied as to develop utterly divergent species, for ex- 

 ample, the lion, the tiger, the puma, the leopard, and 

 the house cat; different types of dogs, wolves, foxes, 

 and their allies. But in each case some intangible 



