1890. | NEW YORK ACADEMY OF SCIENCES. 2% 
Molecular wt. 
Baryta starch (CyH100,),BaO 2.2... 6... o eee ee ewes eneee 801 
Starch (C.Hi00;) Mx ose doee coco polar ON GOO COO MRO OOO OIdOG oS 648 
Je | ee Se cease: Sonera Otc 153 
4(C.Hi00s) + BaO = BaO(C.H10Os).« 
Hence 
BaO (CeH100s) 
158 : 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 ;4, HCl used in neu- 
tralizing the check and actual analyses by 0.0324, a factor 
obtained thus: 1 e.c. of 4, HCl contains 0.00365 gm. HCl and 
is equivalent to 1 c.c. of 34, barium hydrate solution con- 
taining 0.00765 gm. BaO. 
2HCl + BaO = BaCl,. + H.O 
Hence 
4,23 x 0.00765 = 0.0824 
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. 
5 - ‘« «¢ in the extracted grain. 
66 ce fat. 
Se ‘* starch found in the extracted grain, 
(a) (100—y):a::100:x 
(b) 100:x::(100—v + z):x’ 
S 
Na 
x‘ = the amount of starch in the original sample. 
Note.—Dextrin is counted as starch in this process. 
Dr. H. C. Botton 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 Levs, 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 of pandanus fibre. 
He spoke of the indolence of the natives, who expect a high 
price for any work of this character. 
