PREFACE. ‘ 
I trust that its newness may excuse, to some degree, any 
shortcomings in the execution. Such a book has become a 
necessity to myself, and it is hoped will be welcomed by 
others. I trust the work may prove suitable, not only for 
the student of human medicine, but for the incréasing num- 
ber of students of comparative or veterinary medicine, who 
may desire a broad basis for the study of disease in the 
various animals they are called upon to treat. I have en- 
deavored to make the work specially acceptable to the stu- 
dent of general biology. 
It only remains for me to crave the indulgence of all 
readers, and to thank my publishers, Messrs. D. Appleton & 
Co., for their uniform courtesy and the great pains they have 
taken to present the work in worthy form. 
WESLEY MILLs. 
PuysioLogicaL LaBoratory, McGit, Universiry, 
Monrrear, September, 1889, 
