CHAP. II.] DYS-ALBUMOSE. 131 



That portion of the mixed albumoses which is un- 

 5 ' dissolved by saturated solution of NaCl, as well as by 

 solutions containing respectively 10 and 5 per cent, of salt, is treated 

 with water, and the insoluble matter is treated with dilute HC1 

 (0*2 per cent.), in which it is for the most part soluble. The solution 

 is filtered and the filtrate neutralised. By this treatment a con- 

 siderable portion of the substance has become soluble in NaCl, and 

 has in reality been converted into hetero-albumose; that portion 

 which has not been converted into this substance and which has 

 been precipitated by neutralisation, is thoroughly washed with 

 solution of NaCl and water, and then extracted with alcohol and 

 ether. 



When dys-albumose is dissolved in sodium hydrate containing 

 1 per cent., on neutralising, it is found to have been almost entirely 

 converted into a substance soluble in NaCl, precipitable from its 

 NaCl solution with all the characters of hetero-albumose. 



Similarly, when pure hetero-albumose is precipitated from its 

 solutions by an excess of NaCl, a portion of it always appears to be 

 converted into a body identical with dys-albumose, and the same 

 change occurs when hetero-albumose is long preserved under alcohol, 

 or in a dry condition. 



On ultimate organic analysis, Klihne and Chittenden found dys- 

 albumose to have the following composition : 



Carbon 50'88 



Hydrogen 6'89 



Nitrogen 17'08 



Sulphur 1-23 



Oxygen 23*92 



From the facts observed by them relating to the conversion of 

 hetero-albuinose into dys-albumose and the converse, Ku'hne and 

 Chittenden draw the conclusion that dys-albumose is but hetero- 

 albumose which has been converted into an insoluble modification 

 through the agency of neutral salts. 



The annexed table exhibits the mean of all the results of Kiihne 

 and Chittenden's analyses of the albumoses, as well as of their 

 determinations of the specific rotatory power of each. 



Neumeister's According to Neumeister the soluble albumoses 

 views concern- should be divided into (1) primary albumoses which 

 ing the albu- include proto-albumose and hetero-albumose and (2) 

 secondary albumoses, viz., so-called hemi-deutero-albu- 

 mose and ampho-deutero-albumose; the primary, representing a first 

 stage of hydration, and the secondary a subsequent hydration. 



Secondary albumoses are, according to Neumeister, distinguished 

 from the primary by the following reactions: (1) they are not 

 precipitated by nitric acid from solutions which are free from saline 



92 



