50 WILLL^MS. 



Table II. — Anolvse-s of bark of Rhizophora coiiiugata Linn.^ 



5ar:i;'.c No. 



Diam- 

 eter of 



Parts per 100 of water-free 







tree. 



Io9(d- Total X(m- TSan- 

 nble. extract. taimiD. nin, 





O,. 



. 



I.i 



■>- 



62.8 



37.2 



laS ; 26.9 



16 



32 



9&Q 



42.0 



9.6 ■ 32.4 



•ts 



27 



63.0 



37.0 



10.7 '■: 36l3 



SI 



a 



§9l3 



44.7 



UlS 



2&4 



.■» 



3S 



5&2 



43.8 



15.3 



asLS 



3S 



an 



58l8 



41.2 



]5u4 



29l8 



5A 



30 



^.1 43l9 



14.«l ' 31.1 1 



So 



60.7 39.3 12.-5 35.8 ' 



61 



25 



39L9 40.1 13.4 26.7 



27.7 



38.8 H.; 13.4 27.8 



1 



■An average tree ■srij; T^.sld tark lo ite vaiae of 5 pesos. One ton of fresb bark is 

 wortb 35.77 pesos. See icc;r.Q:e a" lo Table I. 



A composite of the nine samples shows 1.9 per cent of "''reds."' 

 Bruguiera gymnorrhiza Lam. and B. eriopetaia W. ji: A. 



Both these species are known hy the native name pototan or pitu- 

 ian. They can he distinguished only hy their flowers, the most obrious 

 difference being in their color. Those of Bruguiera gymnorrhiza Lam. 

 are red : of Bruguiera eriopetaia yeUow. WTien the samples were taken, 

 in most cases flowers were not visible and the two species therefore have 

 been taken together. They c-onstitute alx>ut 20 to 30 per c-ent of the 

 workable trees. The maximum diameter is 1 meter; the average 

 diameter 40 to 45 centimeters, escluding trees under 20 centimeters. 

 Three average-sized trees yielded 190 kilograms each of fresh bark. The 

 scale is dark, about -5 millimeters thick, and adheres rather strongly to 

 the inner bark. The latter is of a dark orange-c-olor, somewhat fibrous, 

 and c-ontains 40 to 50 per c-ent moisture. The wood is like that of the 

 other BhizopJioracece. but is more valuable bec-anse of the size of the trees. 

 It contains 6 to 8 per cent of tannin. 



