462 Scientific Intelligence. 
number of facts to prove the contrary.— Ber. Berl. Chem. Ges., 
viii, 287, 419, March, April, 1875. 
2. On the Constitution of Ammonium Compounds. —The ques- 
tion of fixed or a saaiesietion is yet a vexed one in Chemis- 
try. V.Muyur and Lecco have made an investigation to ascer- 
tain whether nitrogen has in the ammonium compounds an 
equivalence of three or five. On the aed Hodgson the con- 
stitution of ammonium chloride would be : H---Cl; 
the latter it would be H,=!=N—.—CL "The ‘method by which 
the authors purposed to test the question was to submit to minute 
comparison the two di-methyl di-ethyl derivatives of ammonium, 
which may be thus formulated: N CH, +C,H,Cl, and 
H 
gtts 
C,H, 
N Daan If ge be a . these two bodies 
found to be tAsatient, The h ppothéais that ammonium chloride 
id seem, therefore, to be negatived, 
and the quinquivalence of nitrogen in all the ammonium eriva- 
tives established.— Ber. Berl. Chem. Ges., viii, 233, repent he 
3. On Methyl aldehyde and Methyl formate.—Methyl ‘aidan yae 
was prepared by Hofmann, the discoverer, by passing a mixture of 
receiver, one or two wash bottles, and an ohare The current 
of air is "regulated so that the coil does not appear red in da “light, 
w yet it is sufficiently hot to prevent condensation in the 
adapter. If the aspiration be continuous, it is only necessary to 
keep the lamp filled in order to have the process continuous. "Phe 
author collected in his experiments 90 to 100 grams of liqui 
= receiver in twenty-four hours, By the warmth of the hand it 
reduced in a few minutes a solution of ammonio-silver nitrate and 
