534 



CHEMISTRY OF THE PROTEIDS 



CHAP. 



Hammarsten, 1 Neumeister, 2 Winternitz, 3 and Brauer ; 4 the mucins of 

 the snail 5 and the eggs of the perch 6 by Hammarsten ; that of frog's 

 spawn by Giacosa 7 and Schulz and Ditthorn; 8 that of hag -fish 

 (Myxina) by Waymouth Eeid. 9 The mucins of the gastric and the 

 intestinal mucous membranes have not been specially investigated, 

 although judging by histological staining reactions the gastric mucous 

 cells are much less acid than are the intestinal ones (Mann). The 

 glucosamin prepared from these two mucins is, however, the same, 

 and also resembles that prepared from the mucin of the respiratory 

 tract. The mucilaginous substances of the ovarial cysts are discussed 

 below. The following percentage analyses have been made : 



Whether the great differences shown depend on the existence of 

 different mucins or on the want of purity of the preparations is un- 

 certain. In their reactions the different mucins so closely resemble 

 one another that the description of the carefully examined sub- 

 maxillary mucin, given by Hammarsten, holds good for all the other 

 mucins. For methods of preparation see under bile-mucin, p. 537. 



1 0. Hammarsten, Konigl. Gesellsch. der Wissensch. zu Upsala, June 15, 1893. 



2 R. Neumeister, Sitzungsber. der Wurzburger physikal.-medizin. Gesellsch. March 8, 

 1890 (reprint). 



3 H. Winternitz, Zeitschr.f. physiol. Chem. 21. 387 (1895). 



4 L. Brauer, ibid. 4O. 182 (1903). 



5 0. Hammarsten, Pflugers Arch. f. d. ges. Physiol. 36. 373 (1885). 



6 0. Hammarsten, Skand. Arch. f. Physiol. 17- 13 (1905). 



7 Piero Giacosa, Zeitschr. f. physiol. Chem. 7. 40 (1882). 



8 F. N. Schulz and F. Ditthorn, ibid. 29. 373 (1900) ; 32. 428 (1901). 



9 Waymouth Reid, Journ. of Physiol. 13. 340 (1893). 



10 0. Hammarsten, Zeitschr. f. physiol. Chem. 12. 163 (1887). 



11 Fr. Miiller, Zeitschr. f. Biolog. 42. 468 (1901), (the older work by himself and 

 by his pupils is here reviewed). 



12 0. Hammarsten, Zeitschr. f. physiol. Chem. Q. 194 (1882). 



13 J. Otori, ibid. 42. 453 (1904), (the percentage calculated from a supposed ash- 

 free substance). 



14 K. Mitjukoff, Dissertation, Bern, and in Archiv f. Gyniikol. 49. 42 (1895). 



