Latent Heats of Fusion. 441 



1894), and 23'4 (Tammann, Zeit. physikal. Chem. xxix. p. 64, 

 1899) . Bruner's value is stated by him to be in " sufficient " 

 agreement with the value 21*5 determined from the value of 

 E, quoted by Nernstfrom the paper of Eykmann. We refer 

 to these points in order that a comparison may be instituted 

 between the accuracy attained in previous researches and 

 that of the present preliminary experiments. It will be seen 

 that such a comparison is very favourable to the latter. 



Experiments with Phenol. 



The phenol was purified by distillation ; the product used, 

 which was perfectly white, had a B.P. 181° C. and M.P. 

 41°-5 0. 



1st Experiment. — R = 2*80 ohms; C = 1'08 amps.; time 

 £ = 47-95 mins. ; W= 77-357 grms. '.*. L = 28' 93 gram cal. 



2nd Experiment. — R = 2'80 ohms; C = 0*74 amp. ; time 

 £ = 119 mins. ; W=89'29 grms. .\ L = 29'2 gram. cal. 



These values of L do not agree with the value given by 

 Nernst in the table previously referred to, and consequently 

 do not agree with the values calculated in Eykmaniv's 

 paper ; the latter gives L = 25. 



Owing to the large value of t used in the two experiments 

 quoted above there is a possibility of the determined value of 

 L being somewhat too large, although we are not inclined to 

 think that 25 cal. is the correct value. We hope, therefore, 

 to repeat the determinations for phenol with greater accuracy 

 at a later date. Some improvements in the experimental 

 method are also being worked out. 



Experiments with Sulphur. 



It was originally intended to carry out experiments with 

 both monoclinic and rhombic sulphur, so as to enable us to 

 calculate the heat of transition from the values of L for 

 these two substances. The attempts to find the latent heat 

 of rhombic sulphur were not successful, because during the 

 time required to get the sulphur in the inner and outer 

 vessels at the same temperature the transition from rhombic 

 to monoclinic sulphur took place rapidly, 



The sulphur used was recrystallized from toluene. 



This sulphur was placed in the outer bath, heated to 130° C. 

 and kept as nearly as possible at this temperature for two 

 hours. It was then cooled and began to solidify at 120° C. 

 It was kept at this temperature by being surrounded with a 



