MAUMENE TEST. 267 



The results calculated for 100 per cent, acid were obtained by 

 the following formula : 



21-5 



Rise of temp. X - ^r ~^ = rise of temp, with 100 



per cent. H 2 S0 4 - 78-5 per cent> add 



Richmond Modification.- The author calculates the " Rela- 

 tive Molecular Maumene " figure by the following formula : 



21-5 20 + ft 19-5 

 R.M.M. = R x ^^ X -- X ^; 



where R = observed rise of temperature, 



x percentage of H 2 S0 4 in acid, 

 h = heat capacity of apparatus, 

 K = potash absorption (per cent.). 



25 grammes of oil were used and 5 c.c. of acid. 



The method is performed as follows : A beaker about 1J inches 

 in diameter and 3 inches deep is fitted, by means of a ring of 

 cork, inside a slightly larger beaker ; this is placed in a third 

 still larger beaker, and the intermediate space packed with 

 cotton wool. The heat capacity of this apparatus is next deter- 

 mined ; about 10 grammes of water are placed in the innermost 

 beaker and the temperature noted ; about 25 grammes of water 

 of higher temperature are added, and the final temperature 

 noted. The heat equivalent of the apparatus is calculated by 

 the formula 



where h = heat capacity of apparatus, 



x = weight of water placed in beaker, 



y weight of hot water added, 



a = temperature of apparatus, 



b temperature of hot water, 



c final temperature after mixing. 



The following experiments will show the nature of the value 

 of h : 



c. h. 



grammes. 

 31-2 3-60 



38-5 3-43 



40-0 3-51 



When the innermost beaker holds about double the volume of 

 the oil and acid, its weight multiplied by 0-15 will give its heat 

 capacity with considerable accuracy ; the beaker used above 

 weighed 23-2 grammes ; this multiplied by 0-15 gives 348. 



Twenty-five grammes of filtered and dried fat are weighed 

 into the beaker, and the apparatus with thermometer, together 



