﻿Prof. E. Bunsen's Calorimetric Researches, 181 



the atomic heat becomes 



s c In = 3*23, 



which is nearly equal to that of the other elements. The atomic 

 weight 5 6- 7 removes the anomaly produced by considering the 

 oxide of indium as a monoxide, and ranks it in its whole beha- 

 viour with the trioxides which do not form alums. Therefore 

 the formulae of column II. Table VIII. must be substituted for 

 those hitherto accepted in column I. 



Table VIII. 



I, 



II. 



Black indous oxide 



Yellow indie oxide 



G reen oxide of indium 



Grey oxide of indium 



Indie hydrate 



Indie sulphate 



Indie chloride 



Ammoniochloride of indium... 



In 2 ? 



InO 



5InO,In 2 



4 InO, In 2 



InO, HO 



InO, SO 3 , 3HO 



InGl 



2NH 4 01, 3InGl,2HO 



InO? 



In 2 03 



2lnO,In 2 03 



3InO,2In 2 3 



In 2 3 ,3HO 



In 3 3 ,3S0 3 ,2SO 



In 2 Gl 3 



2NH 4 Gl,In 2 Gl 3 ,2HO 



The ammoniochloride of indium, prepared by E. G. Meyer, 

 has, according to the new formulae, a composition analogous to 

 the ammoniochloride of rhodium, which also contains 2 atoms 

 of water. I have not yet been able to investigate whether or not 

 the modified atomic weight is confirmed by the isomerism of 

 these salts, but I shall return to it in an investigation on 

 rhodium. 



I have not yet been able to ascertain the fitness of the instru- 

 ment for determining the latent heat of liquidity, as the present 

 winter has been very unsuitable for such experiments. I will 

 only remark that the latent heat of liquidity of water can already 

 be derived from the experiments given in this communication 

 with an exactness which leaves nothing to be desired. Accord- 

 ing to equation (2), one division of the calorimeter-scale corre* 

 sponds to 



VSm S w 



— £-=- grms. 



of melted ice. The constant W w derived from equation (8) 

 gives the number of divisions of the scale corresponding to one 

 of the units of heat defined at the beginning of this paper. 

 Therefore a division of the calorimeter-scale corresponds to 



1 



