366 



The Philippine Journal of Science 



1915 



In addition to the mineral matter the organic nontans are in 

 considerable part nitrogenous materials. The quantity of ni- 

 trogenous materials in representative tan liquors is shown in 

 Table XIX. 



Table XIX. — Nitrogen content of Filipino tan liquors. 



[Grams per 100 cc. of the liquors.] 



Sample No. 



Nitrogen 

 as saline 

 ammonia. 



Equiva- 

 lent hide 



sub- 

 stance. 



Total ni- 

 trogen. 



Equiva- 

 lent hide 



sub- 

 stance. 



1 



0.0430 

 0.0405 

 0.0980 



0.234 

 0.223 

 0.540 



0.062 

 0.077 

 0.137 



0.343 

 0.422 



0.754 



3— - . - . 



5 - 





Tests show that extract of camanchile bark contains consider- 

 able quantities of nitrogenous material, and a correction must, 

 therefore, be made. Table XX gives the nitrogen contents of 

 the samples in the preceding table and of a fresh camanchile 

 bark infusion calculated as hide substance in per cent of total 

 solids. 



Table XX. — Nitrogen contents of Filipino tan liquors calculated as 

 percentage of total solids. 



Sample No. 



Saline 



ammonia 



as hide 



sub- 

 stance. 



Total ni- 

 trogen as 

 hide sub- 

 stance. 



Organic 



nitrogen i 



as hide I 



sub- 

 stance. 



1 



11.70 

 8.45 



15.20 

 1.74 



17.17 



15.99 



2L38 



6.60 



5.47 

 7.54 

 6.18 

 4.86 



3 



5 



Fresh __ 









DEMONSTRATION OF SIMPLE, EFFICIENT IMFROVEJIENTS IN THE FILIPINO 



TANNING PROCESS 



Bearing in mind the facts that Filipino tanners do not possess 

 sufficient capital to purchase expensive equipment and that they 

 are indisposed to abandon completely the methods they have 

 used for generations and the cheap labor which they can obtain, 

 an endeavor was made to find simple, inexpensive methods of 

 improvement. In the main this was accomplished without se- 

 rious difficulty. The improvements in the process are very strik- 

 ing, although no doubt they could be still further increased, 

 especially by additional modification of equipment. The follow- 



