80 ELEMENTARY BIOLOGY. [CHAP. 



This muscle is best seen from the dorsal 

 aspect. 



ft. The tibialis anticus : a small muscle beneath 

 and dorsal to the peroneus ; it arises from the 

 front of the lower end of the femur and from 

 the capsule of the knee-joint; below it divides 

 into two slips which are inserted into the dorsal 

 surface of the astragalus and calcaneum re- 

 spectively. 



y. The extensor cruris brevis : this lies internal to 

 the upper part of the last muscle; it arises 

 from the front of the distal articular end of 

 the femur and is inserted into the middle third 

 of the os cruris. 



S. ^^o. flexor tarsi anterior; a small muscle, best 

 seen on reflecting the tibialis anticus ; it arises 

 where the extensor cruris ends, and is inserted 

 into the dorsal face of the astragalus. 



I. The blood- vascular system. 



The dissection of the blood-vessels maybe facilitated by 

 previous injection, as directed in the Appendix C. If 

 a permanent preparation be desired gelatine or plaister 

 of Paris may be preferably employed. For ordinary 

 working purposes, there is nothing more convenient 

 than a mixture of French blue, injected wherever de- 

 sirable with a medicine dropper (see Appendix). 



i. The heart. 



Obtain a freshly-chloroformed Frog and pin down 

 on its back; slit up the ventral integument along 

 the middle line as directed in Section B, and pin 

 back the two flaps, avoiding stretching. Next raise 



