JUGGLING WITH LIFE 



with the ox tribe, and in particular with the pigs. 

 Indeed the porpoise may be regarded as a pig that 

 has taken to the water and perforce become carniver- 

 ous in diet. It is necessary also to record the rather 

 unflattering observation that the blood of the por- 

 poise shows more pronounced affinities with human 

 blood than with that of most other animals. 



The family groupings among reptiles show close 

 blood relationship between lizards and serpents, and 

 a slightly less close relationship between turtles and 

 crocodiles. The reptiles are more closely related to 

 birds than to mammals. The relationship appears to 

 be particularly close between birds and turtles; less 

 close between birds and crocodiles; the avian rela- 

 tionship with lizards and serpents being still more 

 remote. 



FROM LABORATORY TO POLICE COURT 



These tests singularly confirm the conclusions of 

 the zoologist, based on study of the anatomical struc- 

 tures of the different tribes of animals; but the testi- 

 mony is absolutely independent, the tests being made, 

 as already pointed out, by means of blood alone. 



Indeed the maker of the test may never have seen 

 a specimen of the species whose rank in the organic 

 scale he is determining. The specimens of blood that 

 Professor Nuttall used in his classical series of exper- 

 iments were collected from a multitude of sources; 

 no fewer than seventy different persons sending 

 specimens from different parts of the globe. 



Many of the collectors were hunters, who merely 

 dipped a piece of filter paper in the blood of a quarry 



159 



