210 BACON AND GANA. 



Table IV. — Analysis of mangrove barks from Harau-ak, Borneo. 



Common 

 name, 



Scientific name. 



Mois- 

 ture, 

 (per 

 cent). 



Inisol- 



ubil- 



itv 



(per 



cent). 



Total 

 ex- 

 tract 

 (per 

 cent) . 



Non- 

 tannin 



(per 

 cent). 



Tannin 



(per 



cent). 



Gayong, 

 BalsO .. 

 Putut—, 

 Tumu - 

 Tangal 



Rhizophova mucronata Lam 



R/iizopkora conjugata Lam 



Bruguiera gymnorrhiza Lam 



Bntgaiera criopetala W. & A 



Ceriops iagal (Perr.) C. B. Robinson 



14.4 

 14.7 

 15.5 

 16.1 

 13.8 



70.1 

 58.3 

 64.3 

 64.0 

 63.8 



■29.9 

 41.7 

 35.7 

 36.0 

 36.2 



9.4 

 9.6 

 9.0 



8.8 

 6.9 



20.5 

 32.0 

 26.7 

 27.2 

 29.3 



Analysis was made of some samples of mangrove barks brought from Sarawak. 

 Borneo by Dr. Foxworthy of the botanical division of this Bureau. These barks 

 are used by cutch factories and among the species in Borneo probably yield the 

 highest amount of tannin. 



