The Heats of Reactions. Calorimetry and Van't-Hoff. 1
  It has been supposed that the law of conservation of energy in chemical reactions has the following form: dU=dQ-PdV+SUM Earlier the author has shown that for the biggest part of reactions it must have the following form: dU=dQ+PdV+SUM In the present paper this result is confirmed by other experiments. 
I. A. Stepanov (University of Latvia, Riga, Latvia)