284 The Philippine Journal of Science iw 



superior in percentage yield of alcohol to those of the preceding 

 experiments with more dilute solutions. The length of time for 

 the fermentation from beginning to end is two to three days 

 longer than by the method in vogue here, but the initial solution 

 being of smaller bulk requires less space, and the cost of the 

 extra space would be compensated for by the greater yields 

 of alcohol obtained. Besides, much space is at present consumed 

 by the tardiness in distillation when the fermentation is com- 

 plete. It is common practice to allow the must to stand several 

 days after fermentation is finished. The distillers do not realize 

 that the delay results in a loss of alcohol from evaporation and 

 from bacterial action, more especially the latter. 



In order that further data on this method might be collected 

 from more thorough trials, the nine experiments recorded in 

 Table XII were performed. The nine samples were first made 

 by diluting 30 grams of the stock molasses to 200 cubic centi- 

 meters and adding the regular amount of sulphuric acid and one 

 equivalent of ammonium sulphate. This solution stood two days 

 until the fermentation was proceeding strongly, in the case of 

 the first of each duplicate, while the second, of each duplicate 

 stood for only one day, and then to : 



No. 1 were added 300 cubic centimeters of a solution containing 60 



grams of molasses and the regular amount of acid ammonium 



sulphate. 

 No. 2's were added 300 cubic centimeters of a solution containing 70 



grams of molasses and the regular amount of acid and ammonium 



sulphate. 

 No. 3's were added 300 cubic centimeters of a solution containing 80 



grams of molasses and the regular amount of acid and ammonium 



sulphate. 

 No. 4's were added 300 cubic centimeters of a solution containing 80 



grams of molasses and the regular amount of acid and ammonium 



sulphate. 

 No. 5's were added 300 cubic centimeters of a solution containing 90 



grams of molasses and the regular amount of acid and ammonium 



sulphate. 



On the following day the following solution was added to : 



No. 1, 110 grams molasses, regular amount of acid and ammonium 



sulphate in 500 cubic centimeters. 

 No. 2's, 120 grams molasses, regular amount of acid and ammonium 



sulphate in 500 cubic centimeters. 

 No. 3's, 120 grams molasses, regular amount of acid and ammonium 



sulphate in 500 cubic centimeters. 

 No. 4's, 130 grams molasses, regular amount of acid and ammonium 



sulphate in 500 cubic centimeters. 

 No. 5's, 130 grams molasses, regular amount of acid and ammonium 



sulphate in 500 cubic centimeters. 



