CHEMISTRY. 297 



coming indigo blue on strongly heating; clirysoi'din deep orange, turn- 

 ing almost to scarlet on heating; alizarin, ruby -red or maroon; eosin, 

 golden -yellow; primrose (naphthalene yellow), first yellow then color 

 discharged; chrysaniliue, brown fluorescence; aurin, yellowish brown; 

 atlas orange, rose-color, changing to scarlet on heating; atlas scarlet, no 

 alteration; biebrich scarlet (E), blue-black; ditto (B), blue-green; aniline 

 scarlet, permanent golden-yellow; indulin, slaty blue to indigo. All 

 violets give a yellow or brownish yellow; phenyl and diphenylamine 

 blues dark brown solutions; iodine and malachite greens bright yellow 

 solutions, the former giving oflt' iodine on heating ; and finally citronin, 

 which gives a pale cinnamon color or a neutral tint. — {Nature^ xxii, 448, 

 September, 1880.) 



Schiitzenberger has given in an elaborate memoir the results of his 

 investigations into the chemical character of albumen based on the ob- 

 servation that when subjected, under suitable conditions, to the action 

 of baryta water it breaks up entirely, or almost entirely, into definite 

 crystallizable principles. His results show that the mixture of fixed 

 principles derived from albumen by hydration contains only amido-de- 

 rivatives, and that these may be divided into two unequal portions ; 

 one, about 16 or 18 per cent., containing substances in which the nitro- 

 gen ratio is 1:3, 1:4 or 2:5, mostly acids; and a second, four-fifths of the 

 residue, represented by the formula (OuH2uK204)x, the value for n being 

 a little less than nine. Albumen is therefore probably an imido-deriva- 

 tive, whicli changes by hydration into a mixture of amidoderiva- 

 tives.— (Ann. Cliim. PJnjs., V, xvi, 289, March, 1879 j J. Ghem. iSoc.j 

 xxxvi, 54G, July, 1879.) 



