38 SCIENCE PROGRESS. 



Deutero-albumose is a secondary albumose, and is thus 

 nearest to the peptones not only in its reactions but also 

 in its order of formation. 



The similar products formed in the digestion of globulin 

 may be called globuloses ; of vitellin, vitelloses ; of casein, 

 caseoses ; of myosin, myosinoses ; there are individual 

 minor differences, but all are closely similar to the albumoses 

 already described, and the general term proteoses includes 

 them all. The products of digestion of elastin, and of 

 gelatin, have also a general resemblance to the proteoses 

 and peptone. 



Such briefly is a summary of our knowledge of proteo- 

 lysis produced by gastric digestion. But within the last 

 year or two further points of detail have been taken up and 

 worked out, and it is to these that it is the special object 

 of this paper to draw attention. In so doing it will be 

 necessary to restrict our consideration to those papers in 

 which peptones and albumoses are treated from the diges- 

 tion point of view. It would lead us too far to take up 

 another branch of this subject which has recently attracted 

 so much attention, namely, the chemical action of micro- 

 organisms, and the poisons they produce. Suffice it to say 

 that in numerous instances the toxines, and antitoxines of 

 bacteriologists, are proteoses, or substances closely allied to 

 them. 



Pekelharing * has attempted to throw doubt upon the 

 individuality of peptone and upon the ammonium sulphate 

 method of isolation, claiming that proteoses are only par- 

 tially precipitated by the ammonium salt, and that the so- 

 called peptone is merely a mixture of albumose or proteose, 

 with some unknown substance or substances. In support 

 of this view he apparently finds it impossible to prepare 

 a peptone which will not yield some proteose by treat- 

 ment with ammonium sulphate, or which will not show the 

 presence of proteose by such reagents as trichloracetic 

 acid. 



This criticism has led to renewed research on the part 



1 Centralblatt f. Physiol., vii., p. 43. 



