I2 4 



EVOLUTION AND DISEASE. 



rately localize pricks from a pin made upon the parasite. 

 Although the parasite seemed to possess independent 

 reflex centre, it had no power of spontaneously moving 

 the limbs, neither had the autosite any control over them. 



FIG. 69. A Green Lizard (Lacerta mridis], with dichotomy 

 of the tail. 



Parasitic foetuses similar to Ake and Lalloo and the 

 calf occur in cats, dogs, and lambs. In such cases the 

 nature of the abnormal appendage is obvious enough, 

 but in cases where the growth of the second embryo 



