128 IOWA ACADEMY OF SCIENCE Vol. XXVI, 1919 



kin. It might also be remarked that while it is highly carnivorous, 

 at least for a squirrel, it preys largely upon helpless forms and does 

 not need to use great caution in capturing them. The meadow 

 mouse, which is largely herbivorous, commonly uses its hind limbs 

 alternately but the nature of its habitat might readily account for 

 this as it would be difficult for an animal which lives under low- 

 hanging herbage or obstructions of any kind to go by means of 

 hopping. Aside from these exceptions, however, it would certainly 

 seem that in those smaller forms which live in the open in places not 

 remarkably secluded there must be some relation between the types 

 of tracks, food and disposition. 

 Department of Botany, 



Iowa State Teachers College. 



