370 G. M. Wetherill on Compound Ammonium Amalgams. 



oxalate, the motlier water was evaporated to dryness and boiled 

 with 95 per cent alcohol ; the hot filtrate on cooling jdelded 

 nacreous scales of methjl ammonium oxalate. The motlier 

 water of these crystals, by concentration, furnisho-l .in ud li- 

 tional quantity a little darker in color. By filtering the crv-t d.^ 

 and washing them with 95 per cent alcohol l)y the aid <")l hw 

 Bunsen filter pump, they were completely freed ti-om the d, .\ 

 mother water in which they formed. As the qn:>ntity oi ^. ■ 

 my disposal was not more than a gram, fearing to red . 

 by a recrystallization, I first tested the clfect oC \i x.jut' 

 the crystals upon sodium amalgam, and then con\rrtcd , 

 tion of each cup to methyl ammonium oxalate in u liirii i 

 was determined. All which remained of the vxAuh- v.- 

 crystallized from a hot solution of alcohol and etlu r -.wA > 

 imented with, as in the former case. The er\ stals api c . 

 the naked eye to be prisms, but the microscope demons , 

 them to be feathery needles polarizing light. They ■■ ■ 

 very electric when warm, and possessed the ])roperty c/tLd.,.^ 

 together when pressed by the finger. Thev viclded golder.-ytv 

 low crystalline scales or plates when com- cried into the Pi sal: 

 This salt is much more soluble than the corresponding aiiiiiiii- 

 nium salt, and crystallizes again from its solution in golden 

 yellow hexagonal and triangular scales, being part of the octa- 

 hedron and its replacements. The following are the results oi 

 the different analyses, from which it may be perceived that 

 the methyl ammonium oxalate is perfectly pure, and that, a^ 

 stated by M. Carey Lea, the first crystallization of the oxalate 

 is pure. 



I noted with respect to the Pt salt that some crystalhzatiou-^ 

 furnished scales of a reddish tinge, but which gave the sanu' 

 percentage of platinum as the golden-yellow scales. The .-maU 

 quantity of substance at disposal for the analysis required very 

 careful weighing to J of a milligram. 



Analysis of methylam. chloroplatinates Jrom raethylam. oxalates. 



First cryst: darker oxalate, 'o-4155 0-172 f^f. 



Repeat, 0-43975 0-18325 4 ;bi 



the last chloroplatin 



Ditto recrystallized, 



" 3 fror 



iiloropl 



ical per cen 

 r ammoniui 



solved 



These different specimens of methyl ammonium oxalate, dis- 

 Ived in water, gave similar results when shaken with soaiui 



