330 Kirkwoop AND Girs: CHEMICAL STUDIES 
On evaporation to a small volume on a water-bath the fresh 
milk becomes darker in color, takes on an odor characteristic of 
sugar syrups and looks not unlike molasses. Cane-sugar crystal- 
~ lizes from it in abundance on cooling. 
The analytic data given on page 329 were obtained in our 
study of the general composition of the perfectly fresh milk of the 
Jamaican nuts.* 
Percentage results in this connection had been obtained pre- 
viously as follows : 
; Organic § Inorganic | Nitrogenous . -Nitrogen-free Carbo- 
Water. Solids. | Matter, Matter. | Substance. Fat. Extractives hydrates. 
91.50+ 8.50 7-31 1.19 0.46 0.07 6.78 se 0! 
91.374 8.63 7-50 rvs ie ea | O.11 oe 7.014 
_ These results were obtained with milk from nuts grown in the 
eastern hemisphere. The milk from the Jamaican nuts appears, 4 
we have seen, to contain less solid matter, both organic and inor- 
ganic. This difference is emphasized by Hammerbacher’s J 0b- 
servations on the specific gravity of cocoa-milk. He describes the 
milk as a colorless, slightly opalescent fluid with a specific gravity 
at 20° C. of 1044.** The milk from two nuts weighed 303-95 
grams. From the nitrogen-free extractive substance in 77-8 grams 
of milk contained in a third nut, 0:8504 gram of dextrose was ob- 
tained. When milk was warmed with dilute sulphuric acid an odor 
of volatile fatty acid became perceptible. A crystalline barium salt 
was prepared from the distillate of the acidified milk which was found 
to consist of barium propionate. 
The milk contains a small-amount of diastatic ferment and also 
oxidase.t} We were unable to detect any other enzymes. 
The following results were obtained by van Slyke? { in his com 
parative studies of the milk of six wxripe nuts and of one ripe n¢ 
*The methods of analysis used for this and similar purposes, throughout &. 
work, were those commonly employed in the laboratory. See Vandegrift and Gies: 
American Journal of Physiology, 5; 287. 1901. ° 
t Hammerbacher : Landwirtschaftlichen Versuchs-Stationen, etc., 18 ? 47? we 
} Konig : Menschlichen Nahrungs- und Genussmittel, etc., 2: 308. 1893. 
also Bizio : Pharmaceutisches Centralblatt, 756. 1833. 
~. - § Including 4.42 per cent of cane-sugar, 
{{ Hammerbacher, /oc,’ cit. ° 
** See our large number of determinations of specific gravity on page 337 
references on pages 328 and 329, _ 
tt Hunger: Journal of the Society of Chemical Indust: : ak gt 
tg 4 try, 20 : 1030. 
tf Van Slyke: Chemisches Centralblatt, 1: 595. 1891. Compare with results er 
page 329. eee 
— 
See page 328. : 
Also 
