ORGANS OF GENERATION. 291 



green, or brownish-green liquid which either contains no pseudo- 

 mucin or with the simultaneous degeneration of colloid very 

 little. The specific gravity is generally rather high, 1.033-1.036 with 

 90-100 p. m. solids. The principal constituents are the albuminous 

 bodies of blood-serum. 



The rare tubo-ovarial cysts contain as a rule a. watery, serous 

 fluid containing no pseudomucin. 



The parovarial cysts or the CYSTS of the LIGAMENTA LATA may 

 attain a considerable size. In general the contents are watery, 

 mostly very pale yellow-colered, water-clear or only slightly opales- 

 cent liquids. The specific gravity is low, 1.002-1.009 ; and the 

 solids only amount to 10-20 p. m. Pseudomucin does not occur as 

 a typical constituent ; albumin is sometimes absent, and when it 

 does occur the quantity is very small. The principal part of the 

 solids consist of salts and extractive bodies. In exceptional cases 

 the fluid may be rich in albumin, and may show a higher specific 

 gravity. 



* The Egg. 



The small ova of man and mammalia cannot, for evident rea- 

 sons, be the subject of a searching chemical investigation. Up to 

 the present time the eggs of birds, amphibians, and fishes have been 

 investigated, but above all the hen's egg. We will here occupy 

 ourselves with the constituents of this last. 



The yolk of the hen's egg. In the so-called white yolk, which 

 forms the germ with a continuation reaching to the centre of the 

 yolk (latebra) and also a layer found between the yolk and yolk- 

 membrane, we find albumin, nuclein, lecithin, and potassium 

 (LIEBERMANN). The occurrence of glycogen is doubtful. The 

 yolk-membrane consists of an albumoid similar in certain respects 

 to keratin (LiEBERMAtftf). % , 



The principal part of the yolk the nutritive yolk or yellow is 

 a viscous, non-transparent, pale- or orange-yellow alkaline emulsion 

 of a mild taste. The yolk contains vitellin, lecithin, cholesterin, 

 fat, coloring matters, traces of neuridin (BRIEGER), glucose in very 

 small quantities, and mineral bodies. The occurrence of cerebrin 



