﻿114 



MEIGS ON THE RELATION OF 



Formulas. 



Atomic 

 Weight. 



Specific 

 Gravity. 



Specific 

 Heat. 



Mean 



Specific 



Heat. 



Atomic 

 Heat. 



Atomic 

 Volume. 



Volume 

 according 

 to Kopp. 



BaO, N0 5 



SrO, N0 5 

 PbO, N0 5 



130.6 



106. 

 165.5 



3.050 



2.948 



4.584 



0.1334 Hm. 

 0.1523 Kg. 



0.1428 



18.6496 

 17.8398 

 19.2* 



42.819 

 35.956 

 36.103 



536.75 

 449.41 

 452.58 



0.1683 Hm. 





BaCI 



SrCl 



PbCl 

 CaCl 



104. 



79.4 



139.2 

 55.9 



3.782 



2.803 



5.574 

 2.127 



0.0780 Hm. 

 0.0896 Rg. 



0.0838 

 0.1085 



8.7152 



8.6149 

 9.2428 



9.1787 



27.498 



28.326 

 24.973 



26.281 



343.75 



353.18 

 312.24 



0.0972 Hm. 

 0.1199 Rg. 



0.0664 Rg. 



0.1642 Rg. 



KO, N0 5 

 NH 4 0, N0 5 



101.2 



80. 



2.030 

 1.643 



0.2690 Av. 

 0.2387 Rg. 



0.2538 



25.6845 

 30.4* 



49.852 

 48.691 



624.71 

 612.00 



... 



NaO, N0 5 

 AgO, N0 5 



85.2 

 170.1 



2.185 

 4.355 



2400 Av. 

 0.2782 Rg. 



0.2591 



22.0753 

 24.109 



38.993 

 39.058 



489.08 

 488.79 



0.1435 Rg. 



NaCl 

 AgCl 



58.6 

 143.5 



2.114 



5.363 



0.2210 At. 

 0.2300 Dl. 

 0.2140 Rg. 



0.2216 



0.0877 



12.9857 

 11.7849 



27.719 

 26.757 



347.09 

 334.81 



0.0844 Hm. 

 0.0911 Rg. 



KO, S0 3 

 KO, Cr0 3 



87.2 

 99.3 



2.640 

 2.652 



0.1690 Av. 

 0.1901 Rg. 



0.1795 



15.6524 

 18.370 



33.030 

 37.443 



413.25 

 468.33 



0.1850 Rg. 



To the first group belong sulphur, selenium and tellurium, substances closely con- 

 nected, not only by their own similarity in chemical properties, but also by that of 

 their analogous compounds. Sulphur and selenium, although their atomic weights, 

 and therefore the magnitude of their atoms, differ so much, correspond very closely, 

 nevertheless, in both atomic heat and volume. Hence, probably, the isomorphism of 

 the sulphates and seleniates, sulphurets and seleniurets — a point which I have not 

 been able to verify satisfactorily, in consequence of not being able to find upon record 

 any reliable specific heats for the seleniates and seleniurets, by which they might be 

 compared with the corresponding sulphur salts. The atomic volume of Pb S is 16.592 ; 

 that of Pb Se, 16.341. The experiments of Mitscherlich show that the sulphates and 

 seleniates crystallize in right, rhombohedral prisms, at a very low temperature ; in 

 octohedrons with a square base, at a mean temperature ; and in oblique prisms, at a 



* Calculated according to the method laid down by Gmelin. 



