2 18 Prof. J. A. Wanklyn and Mr. E. T. Chapman on the [June 21, 



III. Chemical Composition of the Earthy insoluble Minerals, 



Sihca 61-33 



Alumina 1-72 



Protoxide of iron 6*06 



Protoxide of manganese 0-78 



Lime 3-99 



Magnesia 22*02 



Soda 1-38 



Potash 0-83 



Loss 1-89 



100-00. 



III. " On the Preparation of Ethylamine.^' By J. Alfred Wanklyn, 

 and Ernest T. Chapman. Communicated by Dr. Frankland. 

 Received June 8, 1866. 



Having recently had occasion to prepare a considerable quantity of 

 ethylamine, we have made the observation that this base may be obtained 

 with much greater facility than is usually believed. 



We digested together equal volumes of iodide of ethyl, strong alcohol, 

 and aqueous ammonia. The digestion was carried on at a very moderate 

 temperature, certainly not exceeding 80°, but the tubes were constantly 

 agitated. In this manner the reaction is completed in about half an hour. 

 The mixed iodides thus obtained were evaporated to expel excess of am- 

 monia, introduced into a retort ; enough potash was added to neutralize y\) 

 of the iodine present, and the mixture was distilled into dilute hydrochloric 

 acid. The receiver was then changed, the same quantity of potash again 

 added, and the products collected as before. Then six times as much 

 potash was added, and the products collected. The remaining two-tenths 

 of the potash were added separately. 



Portions of each of these fractions were converted into platinum salts, 

 and the amount of platinum was determined by ignition. Each of the first 

 four fractions corresponding to of the total bases obtained, gave more 

 platinum than corresponds even to pure ethylamine, and therefore con- 

 tained ethylamine and ammonia. Only the last fraction, corresponding to 

 of the entire bases, gave a lower percentage of platinum than corre- 

 sponds to ethylamine, and therefore contained the di- and tri-bases. 



Subjoined are the platinum determinations in this last fraction : — 



I. 0-2133 grm. gave 0'0830 Platinum 

 II. 0-3590 „ „ 0-1382 

 or, I. Platinum per cent. 38*91 



II. „ „ „ 38*50 

 Pt Cl^ N C^ Hg H3 CI contains 39*37 per cent, of Pt. 

 Pt CI, N (C, II5), CI contains 35*42 „ 



