12 ART. 12. H. HIROBE : OX THE FUSION SURFACES OF THE 



h. q = the lieat quantity necessary to warm the water only, 

 calculated from its volume, 

 H. C = the heat capacity of the vessel etc. 



As can be seen from the foregoing table the heat capacity 

 of the vessel, etc. depends upon the volume of the liquid con- 

 tained in the vessel. We represented graphically the heat ca- 

 pacities of the latter, using those for 20 c.c. and 40 c.c. of the 

 liquid contained in it. In the next place, witli the help of the 

 values thus found, we determined the specific heat of naphthalene 

 etc. The results are given in the following table and compared 

 with those of former observers. 



From these values we calculated the heat capacities of various 

 solutions, on the assumption that the heat capacity is an additive 

 quantity. 



The heat capacity enters into the calculation as a term of 

 correction in the determination of the fusion point. If it is 

 reliable up to 10'?^ we can in almost all cases calculate the 

 composition of a solution to V/oo. 



The rate of cooling depends not only on the temperature of 

 the bath, but also on the difference between this temperature 

 and that of the room, for heat may radiate into the space above. 

 Hence we observed the rate of cooling immediately before making 

 observations on the fusion points. 



