THE ALCOHOL INDUSTRY. PART I. 



157 



Table XIX. — Yield of sap obtained from 100 coconut trees during the day and 

 during the night for a period of thirty-one days. Two collections per day, 

 morning and evening. Data compiled from Table XVIII. 





Night flow. 



Day flow. 



Total. 



Liters. 



Time in 

 hours and 

 minutes. 



Liters. 



Time in 

 hours and 

 minutes. 



31 days, yield 



2,443 

 0.83 



0.74 



h, m. 



406 57 



13 28 



12 00 



1,699.5 

 0.55 



0.64 



ft. m. 



329 38 



10 18 



12 00 



4, 142. 5 

 1.38 



1.38 



Average per tree 



Average rate of flow 

 of each tree for 12 

 hours 





These results show that when the trees are properly handled by a 

 sufficient number of men to gather the tuba and to cut the stems in 

 order 'to keep the wounds flowing freely, the average daily production 

 of each tree is approximately 1.4 liters and that the flow during the day 

 is nearly as great as that obtained during the night when calculated 

 in twelve-hour periods, namely, 0.64 as against 0.74 liter. ^^ 



When it is recalled that the figures in this estimate of 1.38 liters 

 production daily are obtained from a test of 100 average trees on 

 thirty-one rainless days, and that the actual result under native methods 

 is 0.65 throughout the year and including the rainy season, it is seen 

 that intelligent management will increase the production per tree by 

 over 112 per cent. 



THE COMPOSITION OF THE SAP. 

 With P. Agcaoili. 



I have some reason to believe that the composition of the sap varies, 

 and is effected by all of the conditions which influence the sap flow, 

 namely, the age of the inflorescence and the age, condition, and local 

 surroundings of the tree. 



Samples of sap were collected from eight different trees in the Prov- 

 ince of Laguna during the month of January and four different trees 

 in the Province of Tayabas in the month of April, 1910. It is neces- 

 sary to take the samples during the dry season to avoid contamination 

 by water. The analyses are given in Table XX. 



™Copeland (The Philippine Agriculturist and Forester, (1911), 1, 50), from 

 the investigation of two spathes obtained a much greater flow at night than 

 during the day. He states: "Further, a greater flow during the night is to be 

 expected a priori, as a direct result of exactly the same factors which cause 

 more rapid growth during the night." The maximum flow was 0.304 liter during 

 the night, an amount much below the average. 



