INTEODUCTION 5 



drawings, so that the same detail of a side muscle is usually 

 shown in both the dorsal and ventral aspect of the subject. 

 Similarly, faint details are intensified — a muscle that may 

 present a paper-thin edge to view is represented as thicker, 

 et cetera. 



In the bilaterally symmetrical drawings of muscles which 

 are bisected by a solid line, the detail to the left of the latter 

 is represented as being the more superficial and to the right 

 as deeper. 



From the viewpoint of an experienced anatomist, some of 

 the drawings of muscles are shown in too much detail, and 

 a more finished effect would have been obtained by illus- 

 trating only muscles of one or two particular groups in each 

 figure. From the standpoint of the systematic mammalogist 

 who may wish to do some slight work in myology, however, 

 it is preferable to illustrate the muscles so as to show their 

 positions in respect to as many of their neighbors as possible. 



In those drawings showing muscle attachments upon the 

 bone, blue represents the origins of the muscles and red the 

 insertions. These, too, must be considered as semi-dia- 

 grammatic, for many times the insertion of a muscle is tissue- 

 thin, and for distinctness these must always be shown as 

 much thicker; so that distortion in the true positions of the 

 muscles often follows. 



Fascial origins and insertions are usually represented as 

 being at the side of, rather than upon, the bone. Finally, 

 attention must be called to the fact that it is often quite 

 impossible to decide the precise limits of a fascial origin or 

 insertion. 



In those drawings which are chiefly concerned with the 

 muscles, the names of the latter, abbreviated as little as 

 practicable, are presented in lower case letters, while other 

 terms, as for bones or glands, are printed in capital letters. 



In the myological drawings the intermuscular penetration 

 and emergence of some of the chief nerves is shown, these 

 being represented as cut. 



