Rev. J. B. Emmelt oti the Expansion of Gases hi/ Heat. 419 



given by the table, the density calculated in the last column 

 of this table is perhaps too small. 



Name. 



Sulphate of Soda.... 

 Potash.. 

 Akimine 

 Magnesia 



Iron 



Zinc... 

 Copper . 



Muriate of Soda.... 

 Potash.. 

 Ammonia 

 Lime . 

 Magnesia 

 Barytes 

 Zinc... 

 Copper*.. 



Soda 



Potash .. 



Sp.Gr, 

 Solu- 

 tion. 



Nitrate of 



1-OGO 

 1-055 

 1-026 

 1-294 

 1-219 

 1-373 

 1-189 

 1-210 

 1-145 

 1-070 

 1-351 

 1-272 

 1-265 

 1-607 

 1-271 

 1-231 

 1-157 



Calculated 

 Sp. Gr. 

 Solution. 



1-032 



1-038 



1-023 



1-269 



1-180 



1-360 



1-151 



1-195 



M73+ 



1-093+ 



1-302 



1-321 + 



1-22 



1-404 



1-194 



1-216 



1-035 



Name. 



Sp.Gr, 

 Solu- 

 tion. 



Calculated 



Sp. Gr. 



Solution. 



Nitrate of Lime., 



Barytes... 



Zinc 



Copper... 



Acetate of Soda 



Lime 



Magnesia 

 Alumine 



Iron 



Lead 



Tartrate of Soda 



Potash.., 

 Phosphate of Soda — 



Borax , 



Soda of Commerce 

 American Potash 



1-143 

 1-047 

 1-489 

 1-530 

 1-189 

 1-098 

 1-252 

 1-107 

 1-134 

 1-198 

 1-196 

 1-435 

 1-0.30 

 1-013 

 1-158 

 1-.301 



1-109 



1-045 



1-427 



1-4.39 



1-373+ 



1-0009 



1-159 



1-021 



1-096 



1-174 



1-165 



1-284 



1020 



1-014+ 



1-125 



1-259 



I take the present opportunity to correct a considerable 

 error committed in Brande's Chemistry. In p. 23 (edit. 1819) 

 there is a table of the expansion of gaseous matter : in it the 

 intervals of temperature are equal, and the exparision pro- 

 ceeds according to the terms of an arithmetical series, whose 

 common difference is 208. In p. 118 the rule is given for 

 reducing the volume at any temperature to the volume at some 

 standard temperature : " Divide the whole quantity by 480 ; 

 the quotient will show the amount of its expansion or con- 

 traction by each degree of Fahrenheit's thermometei*. Mul- 

 tiply this by the number of degrees, which the gas exceeds or 

 falls below 60\ If the temperature be above 60°, subtract ; if 

 below 60°, add the product to the absolute quantity of the gas." 

 Now 208, the common difference, is the480-76th part of 1 00000, 

 the assumed volume at 32° ; it is only the .'JOS-Teth part of 

 105824, the volume at 60° : therefore, were the formula correct, 

 508*76 should be the divisor, if the volume were to be reduced 

 to the temperature 60°. But the formula is erroneous ; for 

 the increment answering to an increase of 1° is assumed the 

 480th part of the whole, /. e. at 32°, the 480th part of ] 00000 ; 

 at 212° the 480lh })art of 137440. By the rule, the volume 

 at 212° being 137410, find the volume at 32° ; and it is found 

 to be 85901, instead of 100000. The following iormula will 

 be a|)|)iicable to the table given by Brandc, and most chemists. 

 3 1 1 2 Let 



