101 



be stopped laying and this process of developing ovules cease and 

 possibly go right in the opposite direction, thai is, go back into the 

 body. " 



Figure 16. The oviduct of a hen. Note the various parts the ovary, where the 

 yolk is formed ; the passage, where the white is deposited, and the portion where the 

 shell is laid on. 



Fig. 17 shows a cross section of the muscular tissue of the ovary 

 and shows these ovules embedded in the skin and how they grow 

 larger and larger and finally come 



f/f^ 1HB| H[ 1() the surface and bulge out where 



^^ ^ fe the follicle containing the yolk 



_^ '1 %| forms. 



l^j \ j .. Perhaps the principle of the re- 



*ijii ^ lationship between food consump- 



"* ^ tion and the development of the 



ovules can be best demonstrated by 

 curves shown in Fig. 18, taken 

 from Bulletin 258, Cornell Experi- 

 ment Station. Here we have three 

 sets of curves that show the rela- 

 tionship of food consumed per 

 fowl, the weight of their bodies 



and their egg production at differ- 



Figure IT. A cross section of the ov- ent times during the year. The 



ary of the fowl, showing the undeveloped ]j nes runn i n g llp and down this 

 ovules imbedded in the tissue. . i i / 



chart mark off the periods ot a 

 year. The lines running crosswise mark off in pounds in the case of 



