ANALYSIS OP VEGETABLE MILK. 
5a 
assumes at first the appearance of an agate with milky 
clouds ; and it seems as if organic membranes were forming 
under the eye of the observer. When the coagulum extends 
to the whole mass, the yellow spots again disappear. By 
agitation it becomes granulous like soft cheese.* The 
yellow colour reappears on adding a few more drops of 
nitric acid. The acid acts in this instance as the oxygen of 
the atmosphere at a temperature from 27° to 35° ; for the 
white coagulum grows yellow in two or three minutes, when 
exposed to the sun. After a few hours the yellow colour 
urns o brown, no doubt because the carbon is set more 
tree progressively as the hydrogen, with ’which it was com- • 
bmed, is burnt. The coagulum formed by the acid becomes 
viscous, and acquires that smell of wax which 1 have 
observed in treating muscular flesh and mushrooms (morels') 
Trntrb 1 !! C « Cld ’m Ac ° 0rdmg to the flne experiments of Mr. 
Matchett, the albumen may be supposed to pass partly to 
when nit) gelat:m f\ The coagulum of the papaw-tree, 
solves in " P re P { Hed, being thrown into water, softens, dis- 
solves in part, and gives a yellowish tint to the fluid. The 
W Pk C T d m °- 0ntact witl * water on ly> forms also mein- 
an instant a tremulous jelly is precipitated 
stm mg starch. This phenomenon is particularly striking 
n the water employed be heated to 40° or 60°. The iellv 
condenses in proportion as more water is poured upon it 
It preserves a longtime its whiteness, only growh/vdlow 
by the contact of a few drops of nitric acid d., .,j j ,, 
experiments of F„«,o, aSd ttajS 3 Z 
not pure ^ U 
The formatiou of b iL aCUl "V ®* 1 ‘j"! fu , rni?bes °W» to the albumen, 
nevertheless mnel, coagulum of the hevea, or of real caoutchouc, is 
atmospheric Zl ." T- C 0 I J taCt with the air - The absorption of 
butter which elkts at r" he , ! eaS ‘ I,ecessar >' to the production of 
it cannot be dnnhl l ^ e^ fo, [ med .!" the milk of animals; but I believe 
the pellicles of c mnf v^’ ' V'® ml 1 k ot plants > this ab sorptiou produces 
are ° f c 1 0 a S ulatel albuma ". a '‘d of caseum, which 
f formed in vessels exposed to the open air. 
