M. C. Lea on reactions of Ethylamine and Diethylamine. 85 
HI,N. The action of iodine is consequently in both cases ex- 
actly analogous, two atoms of hydrogen are replaced by two of 
iodine 
Gilm therefore seems to be in error in asserting that no sub- 
stitution-product from ethylamine analogous to so-called iodid 
of nitrogen (biniodamine) can be obtained. 
This iodine substitution-product from ethylamine and diethy1- 
amine, cannot, unfortunately, be obtained in a state of purity 
sufficient for reliable analysis, otherwise the examination of the 
diethylamine product would be interesting. For in ethylamine, 
there are two atoms of the hydrogen of the ammonia type 
remaining, 
C,H 
4 H’ 
H 
and there is no difficulty in supposing them to undergo a substi- 
tution by iodine. But in diethylamine there remains but one— 
C,H, 
C,H, ts 
H 
Nevertheless diethylamine under the action of iodine affords a 
substance exactly resembling that produced from ethylamine. 
To effect the analysis of a substance having an equivalent in the 
neighborhood of 300 so as to speak with confidence of the pres- 
ence or absence of a single equivalent of hydrogen, it would need 
to be obtainable in a state of perfect purity. This however has 
Not so far been possible. 
Isomorphism of Ammomas, ‘ 
in few experiments made in this direction gave the following 
its ; 
Ethylamine alum.—Octahedra of sulphate of ethylamine and 
alumina were obtained. ; 
Lartrate of diethylamine and soda,—In order to determine 
Whether diethylamine was capable of replacing ammonia in the 
Magnificent crystalline forms of the double tartrates, this salt 
te 
diethy lamine was capable of replacing ammonia in Mitscherlich’s 
&Toup of double ite etay RO, SO,+MO SO,+6HO; with the 
“aracteristic crystal-form, the double a of zine and 
diethy lamine was formed. A deliquescent solution was obtained 
Which in vacuo over sulphuric acid afforded a crystalline mass, 
ftom which no conclusion as t0 isomorphism could be drawn. 
* Jahresbericht der Chemie, 1858, p. 340. 
