550 



CHEMISTRY OF THE PROTEIDS 



CHAP. 



TABLE SHOWING THE PERCENTAGE COMPOSITION OF THE MUCIN-SUBSTANCES 

 FROM ASCITIC AND SYNOVIAL FLUIDS 



The presence of nucleo-albumins in synovial fluids is mentioned on 

 p. 407. 



The phosphorus-containing albumins found by Stahelin in exuda- 

 tions are probably derived from leucocytes. 



8. Mucoid from the Egg-coverings of Sepia and from Sponges 



The eggs of the octopus family are surrounded by a tough elastic 

 covering, which is the solidified secretion of the nidamental glands. 

 This mucoid has the same composition as have other mucoids, accord- 

 ing to v. Furth. 1 



Boiling with acids liberates 36 to 39 per cent of an aminated 

 hexose. The egg-covering of Loligo consists also of a glyco-proteid. 



An aminated sugar, after the type of glucosamin, was isolated by 

 v. Furth l from the ground -substance of the gelatinous sponge 

 Chondrosia reniformis. 



III. THE PHOSPHO-GLYCO-PROTEIDS 



These substances contain phosphorus, and only resemble the mucins 

 and mucoids in their carbohydrate-content. Of the two substances 

 described by Hammarsten under the above name, one, namely, the 

 ichthulin, has already been described amongst the nucleo-albumins on 

 p. 405, while the second, or ' helico-proteid,' shall be discussed here, 

 as there is no other place to put it into. 



Hammarsten 2 has found in the serous gland of the vineyard snail 

 Helix pomatia, a proteid having the composition : 



C 46-99 H 6-78 N 6'08 S 0'62 P 0'47 Fe. 



It differs considerably from all other known albumins. Its solution 

 is of a whitish opalescent colour. It is not coagulated by boiling, while 



1 0. v. Furth, Hofmeister's Beitr. 1. 252 (1901). 

 2 0. Hammarsten, Pftilger's Archiv, 36. 373 (1885). 



