94 MINOR PRODUCTS OF PHILIPPINE FORESTS 



calculated on water-free material: Total extract, 34.77 per cent; non-tannin, 

 9.41 per cent; tannin, 25.36 per cent. 



Camanchile bark infusion soon ferments and decomposes in this climate, 

 resulting in the destruction of tannins, the development of a disagreeable 

 odor, and a thickening of the liquid due to a viscous gelatinous formation 

 which accumulates and grows on the surface. A few experiments with 

 phenol as a preservative showed that a concentration of 0.01 per cent does 

 not check the fermentation appreciably, as in a control infusion the 

 tannins were destroyed, the color became a deep wine red — at least three 

 times as intense as the original red orange — a somewhat penetrating smell 

 was given off, and a gelatinous formation and a slimy sediment developed, 

 which made the infusion viscous. After four months the loss of tannin 

 amounted to 15 per cent of the total tannin content. An infusion con- 

 taining 0.1 per cent phenol at the end of the same period showed a practi- 

 cally unaltered tannin content and an acidity equal to 0.0714 gram acetic 

 acid per 100 cubic centimeters. A little fermentation which soon ceased 

 had produced some slimy sedimentation, but had not altered the appear- 

 ance or odor of the clear supernatant infusion. 



Camanchile bark contains irritating principles, which are believed by 

 laborers in the tanneries to indicate roughly the stength of infusions. In- 

 fection of the eyes, producing weakening of the sight, and irritation and 

 swelling of the lids are attributed to them. 



Family BURSERACEAE 



Genus CANARIUM 



CANARIUM LUZON ICUM (Bl.) A. Gray. PiLl. 



A description and figure of this species and its local names 

 are given in the section on resins, gums, and oils. 



According to Gana * the bark of this species contains 7.8 per 

 cent of tannin and gives a satisfactory leather, which is yel- 

 lowish tan, with firm texture and good grain. The tanning 

 process is slow. On account of the value of the nuts and resin 

 produced by this species, Gana did not believe that the bark 

 would be available on a commercial scale. 



Family GUTTIFERAE 



Genus CALOPHYLLUM 



CALOPHYLLUM INOPHYLLUM L. BiTAOG or PalOMAKIA de LA PLAYA. 



A description and figure of this species and its local names 

 are given in the section on resins, gums, and oils. 

 Gana * found that the bark of this species contained 11.9 



* Gana, V. Q., Some Philippine tanbarks. Philippine Journal of Science, 

 Section A, Volume 11 (1916), page 262. 



