226 EMBRYOLOGY IN THE SEVENTEENTH [pt. ii 



EXCERPTS FROM J. F. JOHN'S CHEMISCHE TABELLEN OF 1814 {cont.) 



Substance or liquid 

 investigated 



Chalazae 



Egg-white 



Yolk-membrane 



Yolk 



Egg (Snipe, Tringa vanellus) 

 Shell 



Composition 



An agglutinative substance insoluble 

 in water, apparently like dried tra- 

 gacanth gum 



A white lymphatic transparent sticky 

 slimy material 



Soda, albuminous matter, water, 

 sulphur 



Water, albuminous matter, with 

 some free alkali, phosphate of lime, 

 muriate of soda, and sulphur 



Contains benzoic acid 



Water 80 parts, uncoagulable sub- 

 stance 4-5 parts, albuminous matter 

 15-5 parts, traces of soda, sul- 

 phuretted hydrogen gas, and ben- 

 zoic acid 



Contains sulphur 



Water, albuminous matter, a little 

 jelly, soda, sulphate of soda, muriate 

 of soda, phosphate of lime, oxyde 

 of iron (?) 



An oxydised albuminous substance 

 Apparently an albuminous substance 



Consists of a lymphatic material and 



a fatty oil 

 Water, oil, albuminous matter, jelly 

 Water, oil, albuminous matter, jelly, 

 phosphates of lime and soda, with 

 other salts 

 Water, oil, albuminous matter 

 Water, a mild oil, albuminous matter, 

 a colouring matter which is perhaps 

 iron 

 Water, a yellow mild oil, traces of free 

 (phosphoric?) acid, a small amount 

 of a reddish-brown material, not 

 fatty, and soluble in ether and warm 

 alcohol, a jelly-like substance, a 

 great deal of a modified albuminous 

 substance, and sulphur 



Egg (lizard, Lacerta viridis) 

 Yolk 



White 



Egg (fish, salmon) 



Is composed of the same constituents 

 as that of the hen, but the dark 

 green pigment and the dark brown 

 splashes are probably oxyde of iron 



A yellow oil, an albuminous material, 

 and salts 



Diflfers from that of fowls in being 

 granular and greasy when hardened 

 by boiling 



420 grains contained of pure dry 

 albuminous matter 26 grains, of a 

 viscous oil 18 grains, insoluble al- 

 buminous matter 102 grains, mu- 



Scheele 

 John 



Fourcroy — 



John — 



Macquer 1781 



Thomson — 



Hatchett — 



Jordan — 



Fourcroy — 



John 



i 



John 



John 

 John 



John 



