CHAPTER I. 

 GENERAL ANATOMY OF THE FROG. 



FlG. i. The Common Frog (Rana temporaria] (from Ecker). 



A. External Characters. 



Lay the froj on a board before you ; note, and make drawing* 

 showing the following points : 



1. The division into head, trunk, and limbs ; and the absence 

 of neck and tail. 



2. The two great surfaces. 



a. The dorsal surface, or back, is directed upwards when 



the frog is in the natural position. 



b. The ventral surface, or belly, is directed downwards 



towards the ground. 



