PEEFACE 



Stated briefly, the primary object in view in 

 the preparation of the following pages has 

 been the production of a concise and not too 

 elaborate account of naked-eye and micro- 

 scopic structure which, it is hoped, may be of 

 use to those who have to deal with the fowl 

 in health and disease. It is a truism that to 

 the student of avian and comparative pathology 

 a knowledge of normal structure is essential 

 to the appreciation of changes resulting from 

 disease. And it is admitted that the student 

 of scientific agriculture should know something 

 of the build of the various animal machines 

 with which he is concerned. 



It is also hoped that the student of zoology 

 and comparative anatomy may find herein a 

 useful introduction to avian anatomy and em- 

 bryology. 



The main difficulty experienced by the 

 writer has been the determination of what to 



