6 PREFACE. 
have been inserted in connection with the chapters on 
the abdominal and thoracic viscera. 
The dog has been selected in preference to the rab- 
bit or the cat, the other animals usually employed for 
such purposes, for several reasons. In most respects 
its anatomy corresponds very closely to that of man ; 
the size of the blood-vessels and other organs is rela- 
tively large, and this is especially true of the thoracic 
viscera and the neck region, which can be dissected 
with more success by the beginner upon the dog than 
upon the rabbit. or the cat; if small dogs are. se- 
lected, they will be found to be of a convenient size 
for general laboratory use; finally, most of the usual 
physiological experiments and demonstrations are 
made upon the dog, and a knowledge of its anatomy 
will therefore prove particularly valuable to those who 
intend to make a special study of physiology. 
The directions for dissection have been divided into 
seven chapters, with the idea that a fresh dog would be 
used for each chapter with the exception of those upon 
the muscles of the shoulder and arm, the brain, and 
the eye, requiring therefore four dogs for the entire 
work, though a smaller number may be made to 
answer. To obtain the most satisfactory results, how- 
ever, one must be careful not to attempt to dissect too 
much upon a single animal. When the student is at 
work upon the blood-vessels he should not be required 
to dissect at the same time the peripheral nervous 
system. A much better knowledge of the circulatory 
organs, especially of their relations to each other, will 
be obtained if they are dissected as a whole. After 
learning the anatomy of the blood-vessels the nerves 
can be dissected with greater success, and their rela- 
tions to the arteries and veins determined more easily. 
