. The diseases of poultry. 146 PISKASl-S OK I' The e<^g advaucc-s into the more glandular and vas- cular part of the oviduct and here two otlier layers of albumen are secreted and deposited upon it. Each of these is thinner and more watery than the one which preceded. When the narrow part of tl:e oviduct is reached, two denser layers of albumen are excreted forming the mcmbrana piilaininis. Enclosed in this manner, having acquired its ovate form and with the. Fig-. 37.—Section of fowl's eg-g-; «, shell:/', tnenibrana putaminis; i\r^ laversof soft albumen; ./. clialaziv; <-, cicatr
. The diseases of poultry. 146 PISKASl-S OK I' The e<^g advaucc-s into the more glandular and vas- cular part of the oviduct and here two otlier layers of albumen are secreted and deposited upon it. Each of these is thinner and more watery than the one which preceded. When the narrow part of tl:e oviduct is reached, two denser layers of albumen are excreted forming the mcmbrana piilaininis. Enclosed in this manner, having acquired its ovate form and with the. Fig-. 37.—Section of fowl's eg-g-; «, shell:/', tnenibrana putaminis; i\r^ laversof soft albumen; ./. clialaziv; <-, cicatricula and },'erniinal vesicle;/, air chamber. The oulliiie liirure shows the yolk made up of layers ue- posited successively, <', cicatricula, b, g-erniinal vesicle. small end towards the cloaca, the ^z% enters the uter- ine or shell-forming dilatation. The inner surface of this portion of the oviduct secretes and deposits upon the vievibrana putaminis a thick white fluid which condenses, becomes calcareous and forms the shell. The time required for the ^gg to pass from the infundibulum to the uterus, in the common fowl, is said to be from four to six hours, and it may remain here from twelve to twenty liours. The color of the eg^g-shell depends upon j^igmental matter secreted by particular follicles of tl:e villous. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Salmon, D. E. Washington, D. C. , G. E. Howard & co.
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Keywords: ., bookcentury1800, bookdecade1890, bookleafnumber152, bookyear1899
