224 



EMBRYOLOGY IN THE SEVENTEENTH [pt. ii 



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



Substance or liquid 

 investigated 



Blood of embryo (man) 



Blood of embryo (rabbit) 



Foetal urine (man) 

 Meconium (man) 



Meconium (cow) 



Eggs (wild birds) 

 Air-space 



Shells 



Shell-membranes 

 Egg-white 



Yolk 



Shell-membranes 

 Shell 



Composition Investigator 



Soda, much serum, and some leathery Fourcroy 



fibrous threads, which made up 



only ^ grain out of 3 gros 6 grains 



of cruor . They were jelly-like in con- 

 sistency. No phosphoric acid. It 



differed from the blood of an adult 



(i) in not giving a red flush when 



shaken up with air, (2) in not clot- 

 ting in air, (3) in the fibres being 



more jelly-like 

 Does not coagulate in the cold but Fourcroy 



gives rise to a red serum tending 



towards brown. It was not as solid 



as usual except when heated, then 



it went grey though the supernatant 



liquor was red 

 It is odourless and colourless and of Fourcroy 



a slimy nature 

 Water f , ^r> spirituous extract similar Bay en 



to gall, a black residue dissolving 



partially in water to give a yellow 



colour. He holds it to be a milky 



excrement 

 Contains true gall-like substances 



Date 

 1790 



1803 



Does not contain air of different com- 

 position from atmospheric air 



Phosphate of lime, animal glue, and 

 some combustible substance which 

 escapes with a sulphurous smell 

 from shells when they are softened 

 in acid. Ferrous particles. Some- 

 times some common salt. An egg, 

 which weighed 2 ozs. 2 scruples 15 

 grains, had white which weighed 

 10 qentchen 2 scruples, yolk ^ oz. 

 \ scruple, and shell and membranes 

 2 drachms 5 grains 



An animal material insoluble in acids 



6 qentcfwn 2 scruples 7 grains lost 

 practically 6 qentchen in drying, it 

 contains no caustic salts, the ash is 

 an earthy insipid dust 



Albuminous matter, water, muriate 

 of soda, phosphate of lime, and 

 sulphur 



Albuminous matter, oil, yellow pig- Adet 

 ment 



From 60 eggs, 5^ ozs. oil Dehne 



Albuminous matter with much Adet 

 oxygen 



Carbonate of lime, phosphate of lime, Adet 

 and very oxydised albuminous 

 matter 



Buniva & — 

 Vauquelin 



Hehl 1 796 



von Wasserberg 1 780 



von Wasserberg 1 780 

 von Wasserberg 1 780 



Adet 



