Chemistry. 263 
the spinal marrow and motory nerves, accompanied with tetanic fits ; 
this physiological fact may be made available in the detection of nux 
vomica or strychnine. 
W. Arnotp found that a living frog was the most delicate test for it 5 
he ascertained that tetanus was produced in thirteen minutes after the 
introduction into a wound in the back, of the z5355 of a grain of 
strychnine rubbed up with sugar of milk, and even the zgn¢000 Of a 
grain of the same narcotic, increased to a certain extent the irritability 
_of the frog, after the lapse of half an hour or more. 
Having in one of his experiments employed a frog, which, on the 
preceding day, had suffered from tetanus in consequence of a dose of 
todos of a grain of strychnine, he found that in this animal zypd000 
of a grain produced tetanus, lasting for several hours and proving 
fatal. 
It is also recommended to make use of the paralyzing effect of cer- 
tain other narcotics (morphine, nicotine and cyanogen) upon the action 
of the soak of the frog, laid bare, as a means of deciding on their 
presenc di 
22. einen Calculus, (Chem. Gaz., November, 1845, P. 468, frote 
Archiv. fir Phys. und Prakt. Chem., 1845.)—Urostealite is the name 
given to a new calculus, by M. Sispindins which was detected in the 
urine of a patient under his charge. It fuses, when heated strongly on 
a platinum foil, burns rapidly, and diffuses a strong but agreeable odor, 
which most resembles that of shell-lac and benzoin. It dissolves in 
ether, and also in warm alcohol. EDEB3 
23. On the Milk of Carnivora; by M. Dumas, (Comptes Rendus, 
September, 1845.)—The method by which the milk was analyzed is 
given in detail. If it be required to test for the sugar only, all that is 
necessary is to coagulate the boiling milk with a little acetic acid, 
evaporate nearly to dryness, (this had better be done under the receiver 
of an air-pump,) and the extract, which will have a gummy consistency, 
after standing for some time, yields crystals of sugar of milk, if it be 
present. 
As a type of the milk of carnivorous animals, M. Dumas employed 
that of dogs fed upon flesh. He ascertained that in no instance was 
sugar present, nor could a trace of butyric acid be detected in the milk 
of dogs, after feeding them for fifteen days on flesh. Whereas, if the 
same dogs were fed upon farinaceous food, sugar was invariably de- 
tected, as well as butyric acid ; (this acid, M. Pelouze pointed out a short 
time ago, was readily formed by fermenting sugar with casein.) 
This author thinks that the fatty globules in milk are surrounded by 
casein, for when ether is shaken with milk, it will after some time sep- 
arate from it, leaving the milk with all its original characters, while the 
ether will be found to contain no fatty matter. If we first add acetic 
