36 Chittenden and Hart — Elastin and the Elastose Bodies. 



gnramy precipitate which was dissolved in water, the solution neu- 

 tralized and dialyzed until all chlorine was removed. The solution, 

 on evaporation, left a brownish residue, which was powdered and 

 dried at 110° C. It was readily soluble in cold and hot water, its 

 solution showing no turbidity whatever when heated. It likewise 

 gave no precipitate with alcohol. Unlike the ordinary deutero- 

 elastose, it did give noticeable precipitates with the mineral acids, 

 soluble in excess, and also with acetic acid and potassium ferro- 

 cyanide. Lead acetate and cupric sulphate also gave precipitates, 

 soluble in excess of the metallic salt. Sodium or potassium hydrox- 

 ide failed to give any precipitate. In composition too, the product 

 showed an approach to protoelastose formed by j^epsin digestion, 

 but unfortunately it contained over 5 per cent, of ash, and hence the 

 quantitative results may perhaps be questionable. 



Analysis of the precipitate produced by Salt-saturated Acetic 

 Acid— Trypsin Digestion of B. 



Preeentage composition of ash-free substance. 



16-71 



16-40 



Average. 



54-6.5 



7-04 



16-55 



21-76 



100-00 



Of anything corresponding to heteroalbumose, we have found no 

 trace. Further, under the conditions of our experiments, no appre- 

 ciable amount of true peptone was formed in any of the digestions ; 

 at least, nothing approaching a peptone in reactions was to be found 

 in any of the digestive fluids, after saturation with ammonium sul- 

 phate. We propose, later, to attempt a study of the elastin peptone, 



