336 



Mr. Joule on Specific Heat. 



Name of substance. 



Water 



Hydrogen 



Oxygen 



Sulphur 



Iodine 



Carbon 



Lead 



Zinc 



Copper 



Mercury 



Protoxide of lead 



Protoxide of copper , . . 



Magnesia 



Peroxide of iron 



Subsulphuret of copper 

 Protosulphuret of lead 

 Protosulphuret of iron 

 Bisulphuret of iron ... 

 Chloride of sodium ... 

 Protor.hlor. of copper . 



Chloride of lead 



Iodide of silver 



Iodide of lead ......... 



Sulph. acid, sp. gr. \'S5 

 Carbonate of potash . . , 



Carbonate of lead 



Sulphate of lead 



Sulphate of potash ... 

 Chlorate of potash ... 



Nitrate of potash 



Alcohol 



Formula adopted. 



HjO 

 H2 

 O 



s 

 I 



C 



Pb 



Zn 



Cu 



Hg 

 PbO 

 CuO 

 MgO 

 FesOs 

 CujS 



PbS 



FeS 



FeSj 



Na2Cl2 



CU0CI2 



PbClg 



Ag2f2 



Pbl2 



S03H20 

 2KO+C04 



2PbO+C04 

 PbOSOa 

 KOSO3 

 KOCI2O5 

 KON2O5 





TUT 



tV 



T*T 

 T^T 



tV 



JL 

 2 1 



n% 



^% 



tIit 



1 



-^s 



3 



4 



'S'S 



_4._ 

 100 



T3 9 

 4 



-#- 



2 3 



:rV 



Tf'? 



T2 3" 

 if 



1 . 

 ■S3 U 



s p. 



1000 



6000 



375 



188 



48 



250 



29 



91 



94 



30 



54 



150 



286 



192 



113 



50 



140 



153 



207 



120 



65 



51 



39 



429 



194 



101 



118 



204 



220 



265 



1043 



"3 tj 



1000 



3294 



236 



188 



64 



241 



29 



93 



95 



33 



61 



142 



244 



167 



121 



60 



136 



130 



214 



138 



66 



62 



43 



350 



216 



86 



87 



190 



210 



238 



622 



Experimenter, 



[Berard. 

 De la Roche and 



do. 

 Dulong and Petit. 

 V. Regnault. 



do. 



Dulong and Petit. 



do. 



do. 



do. 



V, Regnault. 



do. 



do. 



do. 



do. 



do. 



do. 



do. 



do. 



do. 



do.s 



do. 



do. 

 Dalton. 

 V. Regnault. 



do. 



do. 



do. 



do. 



do. 

 Despretz. 



The substances chosen in the construction of the above 

 Table are, as I have said, impartially selected. I have omitted 

 some in which the theory was found to agree perfectly with 

 experiment, whilst I have inserted others (as, for instance, al- 

 cohol) which appear to disagree with the theory very consi- 

 derably. On the whole the coincidence between the theore- 

 tical and experimental results is such that I think chemists 

 will agree with me in believing that the law of Dulong and 



