ECONOMIC POSSIBILITIES OF MANGROVE SWAMPS. 

 Table II. — ■Analysis of barks from Mindoro. 



209 



Forest- 

 ry Bu- 

 reau 

 No. 



9779 

 9780 

 9781 

 9782 



'9783 

 9795 

 9816 

 9851 



■9780 



Field 

 No. 



1911 

 1912 

 1913 

 1914 

 1915 

 1921 

 1922 

 1984 

 1912 

 19121 



«1913i 

 1913} 

 1914i 



•1915i 



Common 

 name. 



Bacauan . 



do 



Hangalay 

 Pototan .. 

 Bacauan . 



Tangal 



....do ..... 



..-_do 



Bacauan . 



— -do 



Hangalay 



...-do 



Pototan .. 

 Bacauan . 



Scientific name. 



Mois- 

 ture 

 (per 

 cent) 



Rhkoiihora covjugata L 



do 



Bruguieya parvijloya W. & A 



Bruguiera gymnorrhiza Lam 



Rliizoplioi-a muciwiata Lam 



Cci-iops tagal (Perr.) C. B. Robinson 



do 



do 



RM-ophora conjtigata L 



do '- 



Brnguiera pm-Difiora W. & A j 



do ! 



Braguiera gymnorrhiza Lam 



Rhizopliora mucronata Lam | 



Insol- 

 ubil- 

 ity 

 (per 



cent). 



13.2 

 14.4 

 14.0 

 13.9 

 13.2 

 11.8 

 12.3 

 12.7 

 13.5 

 14.1 

 14.8 

 12.9 

 13.9 

 13.4 



In parts per 100 of 

 water-free bark. 



Total 

 ex- 

 tract 

 (per 

 cent). 



C7.4 



66.6 



77.4 



60.2 



64.3 



69.1 

 72.5 



71.5 



G4.8 



67.1 



75.5 



82.1 



Non- 

 tan- 

 nin 

 (per 

 cent) 



32.6 

 33.4 

 22.4 

 39.8 

 35.7 

 80.9 

 27.5 

 28.5 

 35.2 

 32.9 

 24.5 

 17.9 

 36.6 

 32.9 



12.0 

 10.7 



9.6 

 11.6 

 14.1 



9.7 

 10.5 



8.0 

 10.8 

 10.0 



9.6 



8.3 

 12.6 

 15.1 



Tan- 

 nin 

 (per 

 cent). 



20.6 

 22.7 

 12.8 

 28.2 

 21.6 

 21.2 

 17.0 

 20.5 

 24.4 

 22.9 

 14.9 

 9.6 

 24.0 

 17.8 



^ Analysis of inner bark. 



The barks were collected by Mr. M. L. Merritt in Mindoro in March 1908. 

 Bacauan bark is brittle and is very easily ground. It has a dirty brown scale 

 of variable thickness which is very easily removed from the true or inner bark. 



Analyses were made on both entire and inner bark of each varietj^. In every 

 case inner bark showed a higher percentage of tannin than when entire bark was 

 assayed. 



Bacauan numbered 1912 contained approximately 10 per cent outer scale. 



Bacauan infusions were red, but varied in intensity. 



The Hangalay barks are reddish-brown in color with rough, dark brown scales. 



The inner bark of Hangalay is fibrous and the ground bark was very irritating 

 to the mucous membranes of the nose and throat when inhaled. They also gave red 

 infusions. 



Barks of Pototan and Tangal also possess rough, brownish scales. 



The infusions were somewhat lighter than those of Bacauan. 



Table III. — Analysis of harks from Port Banga, Zamboanga. 



Field 

 No. 



Common 

 name. 



Scientific name. 



Mois- 

 ture 

 (per 



cent). 



In parts per 100 of water- 

 free bark. 



Insol- 

 ubil- 

 ity 

 (per 



cent). 



Total 

 ex- 

 tract 

 (per 

 cent). 



Non- 

 tan- 

 nin 

 (per 



cent). 



Tannin 



(per 

 cent). 



11534 

 11535 

 11536 

 11537 



Bacauan 



Tangal ._ - 



Pototan 



Laiigaray 



Rhizophoru con^ugata Lam 



13.4 

 11.9 

 13.0 

 13.8 



68.7 

 58.6 

 62.0 

 80.4 



31.3 



41.4 

 38.0 

 19.6 



13.3 

 19.1 

 13.5 

 8.0 



18.0 

 22.3 

 24.5 

 11.6 



Ceriops tagal (Perr.) C. B. Robinson- 







This table shows results of analysis made on another lot of barks from Port 

 Banga, Zamboanga, collected by H. N. Whitford on December, 1908. 



