548 Progress in Science. (October, 
larger animals similar cells of suitable dimensions can be constructed of 
larger and thicker pieces of glass. With such an apparatus a current of iced 
water can be passed through the cell, and any injurious effects which might be 
caused by the use of the electric- or lime-light entirely counteraéed. Animals 
may be kept without injury in these cells for several days so long asa constant 
current is maintained. This contrivance offers many facilities for prolonged 
physiological investigations. 
TECHNOLOGY. 
Composition and analysis of the concentrated milk of the Anglo-Swiss 
Company of Cham has been determined by M. A. Mintz. The reaction of 
the milk is feebly alkaline, and its specific gravity is 1°313. Contrary to 
what has been supposed, a certain quantity of inverted sugar is present. The 
composition of two samples was— 
No. 1. No. 2. 
(CeinyeEREIe 65 oa oo 40 oo” Seite 29°4 
ibe ENE 5G 55 bo 50) By 12°4 
Mik Su canteen lilies amet 13'9 
IBN Wa eae aoe aa | na, doy @ CFS 85 
Casein, albumen, and salts .. 110 I2'0 
NW WAWS? “Sal dor soda "oo! psy 257 23'8 
I00'o I00°O 
The amount of inverted sugar increases with keeping. The milks employed 
in the manufa@ure of these two samples must have had the following 
composition :— 
No. 1. No. 2. 
Milk-sugar.. .. 5°2)°_.. 5:2 . 
Buttersen ie. pcs x7} 13°2 x2] 12" 
Casein, &c. zs | solids solids 
Water sie, saves BOOS 87°2 
100°0 ~' | “00"o 
These samples agree closely in their composition with a normal milk, which 
may be taken as— 
Milk-sugar .. .. -» 5°2 
BNE G6 Go a5 da be +o} 130 
Casein, &c. .. 3°8 
Water? "sje ae) isle ewe aes 7eO 
I00°o 
The composition of this milk contrasts very favourably with that generally 
supplied in Paris, which frequently contains not more than 7 per cent of 
solids, of which 1°5 to 2 is butter. 
According to Ch. Méne, Japan wax has been regularly imported into Europe 
for some years, and is quoted at from rj to 2 frs. per kilo. It is extensively 
used for the adulteration of bees’-wax, the value of which ranges from 3? to 
4 frs. per kilo. This fraud may be detected by the specific gravity of the 
sample. That of bees’-wax is 0'96931, that of Japan wax 1'00200. Yet all 
the mixtures containing from 50 to go per cent of Japan wax are lighter than 
bees’-wax. 
M. d’Havrincourt colle@ed cockchafers at the price of a franc per ro litres, 
and having destroyed them with gas-liquor and sulphuric acid, obtained a 
good manure. A previous experiment, where the beetles were worked up with 
lime, gave unsatisfactory results. 
