M. C. Lea on Ethyl Bases. 29 
greatly simplifies the further purification of the diethylamine 
salt left in solution. When these mother waters have been a 
"3884 gms. substance gave ‘1377 platinum. Per cent. 
This corresponds to 35°45 
chloroplatinate of diethylamine should contain 35°45 
It appears therefore that the salt obtained in the above de- 
scribed manner is perfectly pure. 
Picrate of Diethylamine without being deliquescent is soluble 
to almost any extent in water, alcohol and ether. By sponta- 
neous evaporation it crystallizes in a radiated mass. Sometimes 
at the bottom of the vessel beautiful transparent brown yellow 
crystals form, which belong to the monoclinic system. Combi- 
nation observed oP, [oP], OP, oP, +P, and a clinodi- 
agonal doma. 
The approximate proportions in which the different ethyl 
bases were produced by the reaction here made use of were Be 
haps ten per cent of triethylamine, thirty or forty of diethyl- 
amine and fifty or sixty of ethylamine. 
The method here described gives with facility a very exact 
> api of these bases. The only precaution necessary to be 
