APPENDIX. 



PEAOTICAL INSTRUCTIONS FOE STUDYING THE DE- 

 VELOPMENT OF THE CHICK. 



I. A. Incubators. 



Op all incubators, the natural one, i.e. the hen, 

 is in some respects the best. The number of eggs 

 which fail to develope is fewer than with an arti- 

 ficial incubator, and the development of monstrosi- 

 ties is i-arer. A good sitter will continue to sit 

 for thirty or more days at least, even though the 

 eggs are daily being changed. She should never 

 be allowed to want for water, and should be well 

 supplied according to her appetite with soft food. 

 It is best to place the food at some little distance 

 from the eggs, in order that the hen may leave 

 the eggs when feeding. She will sit most per- 

 sistently in a warm, quiet, somewhat darkened 

 spot. When an egg is placed under her, the date 

 should be marked on it, in order that the duration 

 of its incubation may be exactly known. When 

 the egg is intended to remain for some time, e.g. 

 for seven days or more, the mark should be bold 

 and distinct, otherwise it will be rubbed off. 



