857 



TABLE III. 



velocity of the reduction and the extent of the difference of the 

 molecular heat of conihtistion of alcohol and the correlated aldehyde 

 (or ketone). 



The greater this difference the more energy will be represented 

 by the hydrogen atoms playing a role in that transformation. 



As the heats of evaporation of ihe alcohols on one side and of 

 the aldehydes on the other side do not sensibly differ and as all we 

 require here are a few figures for comjiarison, a correction for this 

 may be omitted here. We then find for these differences (according 

 to data from the tables of Landolt-Börnstein-Roth). (See table IV.j 



The heat of combustion of acrnldeliyde is not known, neither 

 that of formaldehyde. There is, however, a statement as to meta- 

 formaldehydc : if from this one calculates the molecular combustion 

 as if it were a monomeride, the difference amounts to 47 cal. As, 

 howe\'er, tiiis also includes the heat of polymerisation the difference 

 is presumably considerably less than 47 calories. 



