202 Lintncr Soluhle Starch [Dec. 



tion of soluble starch in large flocky masses/ The heavy precipi- 

 tate was filtered off and both it and the clear filtrate were saved 

 for the tests mentioned belovv. 



The isolated precipitates of sohible starch, when immersed in 

 50 c.c. of cold vvater, dissolved completely in a few minntes. Each 

 such sokition was then poiired into 400 c.c. of 95 per cent. alcohol, 

 and the mixture allowed to stand for a week. Reprecipitation 

 with a drop of sahne Solution was then effected and the soluble 

 starch precipitate in each case, after being filtered off, was spread on 

 a glass plate and dried before an electric fan. Each desiccated 

 product was a very friable amorphous mass. 



One-half of a gram of the dry product in each case was sus- 

 pended in 10 c.c. of cold water and allowed to stand over night. 

 The next morning a small quantity of undissolved matter was fil- 

 tered off and the clear filtrate tested by the reagents and with the 

 results shown below : 



Polysaccharid. Reduchig substance^. 



lodine Solution Fehling Solution 



Reprecipitated Product i Purple Reduction 



Reprecipitated Product 2 Purple Reduction 



Reprecipitated Product 3 Blue Reduction 



Reprecipitated Product 4 Blue Reduction 



Alcoholic filtrates from DIFFUSION RESiDUES. F'iYst sencs. 

 The alcoholic filtrates from the precipitates of soluble strach in the 

 cases of products 3 and 4 were now evaporated to dryness on water- 

 baths. Each residue was dissolved in a small volume of water and 

 the Solutions tested by the methods and with the results indicated 

 in the following summary: 



Polysaccharid. Reducing substance. 



lodine Solution Fehling Solution 



Filtrate from reprecipitated product 3 Red Reduction 



Filtrate from reprecipitated product 4 Red Reduction 



The soluble starch Solutions that remained in the bags at the 

 conclusion of a second series of dialysis experiments were given the 

 treatment with alcohol, saline Solution, etc., which has just been 



^ Dr. Gies has been obtaining similar results with various colloids in alco- 

 holic Solution, protein salts among them. 



* Blank tests were made as usual and also one on the alcohol used, to see if 

 any reducing substances were present. The blank tests were negative in every case. 



