PROCEEDINGS OF SECTIOX B. 351 



specific gravity of a 10 per cent, solution was found by means of a 

 specific gravity bottle, and amount of dissolved solids determined, 

 using the solution factor 3'92. After allowing for the ash, the per- 

 centage of water was obtained. 



Dextrose. 

 The dextrose was determined by the method of precipitating as 

 glucosazone, described by Davis and Ling (J.C.S., Trans., 1904, p. 24). 

 Under these conditions it was found that 0-1 gram of dextrose gave 

 ♦0731 gram of glucosazone, using approximately the proportions — 

 maltose, 2 ; dextrose, 1 ; dextrin, 1. This is the same value as found 

 by Ling and Rendle for approximately equal proportions. To deter- 

 mine the dextrose, lOccs. of a 10 per cent, solution were placed in a 

 boiling tube, l'5cc. of 50 per cent, acetic acid added, and then Ice. 

 of freshly distilled phenylhydrazine. This was then made up to 20ccs. 

 with distilled water, and boiled in a water bath for one hour. Liquid 

 and precipitate is then poured into a tared Gooch crucible. After 

 liquor has drained away precipitate is washed with boiling water, so 

 that total filtrate does not exceed 50ccs. 



Maltose. 

 Ten CCS. of the 10 per cent, solution of malt extract are made up 

 to 200ccs. with distilled water. The reducing power is then determined 

 volumetrically by means of Fehling's solution. To determine the end 

 point the starch iodide indicator described by Harrison (Pharm. Journ., 

 Aug. 1st, 1903, p. 170) was used. It is possible by this means to de- 

 termine the end point very sharply. The total reducing power having 

 been determined in this way, the percentage of maltose can be found 

 by making allowance for the dextrose already found. 



Dextrin. 

 To determine the dextrin, 25ccs. of this 10 per cent, solution are 

 treated with 50ccs. of a solution of mercuric aganide prepared by 

 making up 120 grams of mercuric cyanide and 120 grams of sodium 

 hydroxide to one litre. This mixture is then raised to the boiling-point 

 of water in a water bath, and kept at that temperature for three minutes. 

 After cooling, the alkali is neutralised by strong hydrochloric acid, 

 volume made up to lOOccs. Solution is then decolorised by animal 

 charcoal, and rotation determined in a 200mm. tube by means of a 

 Schmidt-Haensch half shadow polarimeter. From the observed rota- 

 tion the percentage of dextrin is calculated. 



Albuminoids 

 Were determined by Wanklyn's albuminoids ammonia process, as 

 recommended by C. Graham (Allen's Com. Org. Analysis, vol. i., p. 326). 

 The method is much shorter and gives as good results as the Kjeldahl 

 method. Ten ccs. of 10 per cent, solution are diluted to lOOccs. ; of 

 this diluted solution lOccs. are taken, added to 500ccs. of ammonia 

 free distilled water. To this is added lOOccs. of Wanklyn's alkaline 

 permanganate solution. Distillation is continued until 200ccs. have 



