PRODUCTS. 



17 



the ovary ami is t.-ikt-n up by tin- ovi-lnct, several secondary en- 

 velopes derive d from tin- wall of tin- .\i.luci, vi/.. tin- whit.- .,: 



t \ he albmiii-n. i |n> shell mriuhran.-, and 1 1n- calcar- >u> sh-ll. 



:i of these parts is form, d in a >p.vi:.l region OJ s oviduct 



Tin- latter is divid. d into four regions: (1) A narrow ciliated 

 initial part, into which tin- liberated egg is received, and where it 



niliMil by the spermatozoa air. ady accumulated tin-re; (2) a 



eA.t. 



Fig. 8. Diagrammatic longitudinal section of an uninoubated Hen'i egg, afu-r 

 ..-wliat .-ilt.-retl.) 



b.l. Germ-disc ; w.y. white yolk, which consists of a < '-nti.il tla.xk-shaped niana and a nun. 



concentric layers surK-uiuliii^ tin- yellow jolk (y.y.) ', < .. \ it-llin> m.-mbrane ; z. a somewhat 

 fluid albuminous layer, which imiurdiatrly m\fl< ; . ; rr. albumen competed of 



.ilt<Tiiating layers of more and less fluid portions ; ch.l. chalazie ; a.ch. air chamber at the 

 blunt end of the egg simply a space between the two layers of the shell-mem brai; 

 inner, s.m. outer layer of the shell-membrane ; s. shell. 



iilandular region, cover* d vith longitudinal t'urr'\\-, t'mm which 

 tin- alluiineii is sirn-t* d and spread around the yolk in a thick lay. r ; 

 (3) a somewhat rnlar^td part, cover, d witii small villi. the c.-lls 

 ot whii-h secrete calcareous salts, and thus cause the formation of 

 the shell; (4) si short narrow, r n-irioii, through whii'h the egg 



. pidly. and without undi r^>in^ any t'urth. r change. II 

 heinu r deposited. 



Tlie envelopes t'liniislml in succeion hy the o\iduct have the 

 following coinpoj-ition : 



The white of the egg, or albumen (w), is a mixture of several 

 mat. -rials : according to chemical an;. ! _' albumen, 



