48 



L. F. Nilson and Otto Pettersson. [Nov. 18, 



Formula. 



Molecular 

 weight. 



Specific 

 heat. 



Molecular 

 heat. 



Authority. 



- 



Bo 2 3 



69-8 



0-2374 



1657 



Eegnault 



Cr 2 3 



152-4 



0-1796 



27-37 



55 



Fe 2 3 



1600 



A.I C201 





55 



As 2 3 



198-0 



0-1279 



25-32 



55 



Sb 2 3 



292-0 



0-0901 



26-31 



55 



Bi 2 3 



468-0 



00605 



28-31 





Ti0 2 



82-0 



0-1703 



1397 



5) 



Sit ] ~ 



zk}°> 



90-8 



0-1456 



1322 



55 



Sn0 2 



150-0 



0-0933 



14-00 







87-0 



0-1590 



1383 



H. Kopp 



Anhydrous Sulphates. 



Compounds. 



Formula. 



Mole- 

 cular 

 weight. 



Specific 

 weight. 



Specific 

 heat. 



Mole- 

 cular 

 heat. 



Mole- 

 cular 

 volume. 



Beryllium sulphate . . . 



Be 2 3S0 4 



3153 



2443 



0-1978 



62-37 



129-07 



Aluminium sulphate . . 



A1 2 3S0 4 



342-8 



2710 



0-1855 



63-59 



126-50 



Scandium sulphate . . . 



Sc 2 3S0 4 



3760 



2-579 



0-1639 



62-42 



145-80 



Chromium sulphate . . 



Cr 2 3S0 4 



392-4 



3012 



0-1718 



67-41 



13027 





Fe 2 3S0 4 



400-0 



3-097 



0-1656 



66-24 



12916 





G-a 2 3S0 4 



424-0 





0-1460 



61-90 





Yttrium sulphate .... 



Y 2 3S0 4 



467-0 



2612 



0-1319 



61-60 



178-80 





In 2 3S0 4 



514-8 



3-438 



0-1290 



66-41 



149-77 



Lanthanum sulphate. . 



La 2 3S0 4 



566-0 



3-600 



0-1182 



66-90 



157-22 





Ce 2 3S0 4 



567-0 



3-912 



01168 



66-23 



144-94 



Didymium sulphate . . 



Di,3S0 4 



581-0 



3735 



01187 



68-96 



155 55 





Er 2 3S0 4 



620-0 



3-678 



0-1040 



64-48 



168-57 



Ytterbium sulphate. . . 



Yb 2 3S0 3 



634-0 



3-793 



0-1039 



65-87 



167-15 



Thorium sulphate .... 



Th 2 2S0 4 



4240 





0-0972 



41-21 





The molecular heat of the anhydrous sulphates of the sesquioxides 

 varies only within very narrow limits ; 61"60 — 68'96 for yttrium and 

 didymium sulphate. The values for the salts of chromium, iron, in- 

 dium, lanthanum, cerium, and didymium are nearly identical ; whilst 

 even the values of the remainder approach each other very nearly. 



As the following hydrated sulphates are decomposed when heated 

 to 100°, their capacity of heat was determined between 0° and 46° 

 in the vapour of boiling CS 2 ; the beryllium sulphate not bearing even 

 that temperature without losing water, its molecular heat could not 

 be ascertained. 



