FROG FOOD. 633 
duced into a test-glass, its own bulk of a solution of carbonate 
of soda, of the following composition is added to it: — 
Crystallised carbonate of soda . . .1 part. 
Water . . . . . . . 4 ,, 
Then as much subnitrate of bismuth as will lay on the 
point of a knife, and the whole is boiled ; if the liquid is free 
from diabetic sugar, the subnitrate of bismuth remains white, 
whilst it blackens more or less, however little sugar of the 
glucose species it may contain. 
Cane sugar has no action in this case. Moreover, the 
author has ascertained, that the reaction which we have just 
noticed, belongs only to glucose and its varieties, and that, 
at all events, it is not due to any of the principles ordinarily 
contained in the urine, whilst it has been well proved that 
the alkaline tartrate of copper is reduced by uric acid. — 
Journal fur PraJctische Chemie . 
PROGRESS OE PLEURO-PNEUMONIA. 
From the accounts which we are almost daily receiving, 
it would appear that this fatal malady is on the increase, and 
that it has again shown itself in many localities which had 
for years been exempt from its ravages. These outbreaks, 
however, are as yet but partial, so that we may hope the 
malady will not change from the sporadic form it has long as- 
sumed to its epizootic type. Several instances of its sudden 
appearance have come under our immediate observation; 
and in one of these, some valuable animals fell a speedy 
sacrifice to it, which had had no possible direct communica- 
tion with other cattle for many months, and were also located 
in a district that had been entirely free from the malady for 
five or six years. These facts are valuable, and too many of 
them cannot be recorded. We shall esteem it a favour to 
hear from our numerous correspondents respecting the 
further progress of the affection. 
EROG-EOOD. 
Frogs are being used as an article of food by some of the 
lower classes of Lancashire. — Lancet . 
XXXI. 
84 
