1890.] NEW YORK ACADEMY Of SCIENCES. 27 



Molecular wt. 



Baryta starch (C6H,o05)4BaO 801 



Starch (CsHioO,) X 648 



Barium oxide 153 



4(C6H,o06) + BaO = BaO(CeH,o05)4 

 Hence 



BaO (CaH,o05)4 

 153 : 648 : : 1 : X = 4.23 + 



Therefore 1 part of barium oxide is equivalent to 4.23+ parts 

 of starch. 



Again, the starch figure may be obtained by multiplying 

 the difference of cubic centimetres of y^ HCl used in neu- 

 tralizing the check and actual analyses by 0.0324, a factor 

 obtained thus: 1 c.c. of j^ HCl contains 0. 00;^ 65 gm. HCl and 

 is equivalent to 1 c.c. of ^^ barium hydrate solution con- 

 taining 0.00765 gm. BaO. 



2HC1 + BaO = BaCl. + H^O 

 Hence 



4.23 X 0.00765 = 0.0324 



the value of 1 c.c. of ^ HCl in starch. 



To obtain the amount of dry starch the following calcula- 

 tion is necessary: 



Let V = quantity of water in the original grain. 

 " y = " " " in the extracted grain. 



" z = " " fat. 



'* a = " " starch found in the extracted grain, 



(a) (100 — y) :a:: 100 :x 



(b) 100 :x :: (100 — v + z) : x' 



x' = the amount of starch in the original sample. 

 Note, — Dextrin is counted as starch in this process. 



Dr. H. C. Bolton exhibited a few specimens of the handi- 

 work of the natives of the Hawaiian Islands. These included 

 specimens of Kapa, a kind of light cloth made of the paper 

 mulberry and dyed of several hues ; two kinds of Leis, or gar- 

 lands of small shells; the model of a native canoe with out- 

 rigger, and a fan made of cocoanut palm. Also a fancy bag 

 made of seeds of the papaya. Also, from Samoa, another fan 

 ■and a mat made oi 'pandanus fibre. 



He spoke of the indolence of the natives, who expect a high 

 price for any work of this character. 



