Very moist substances a difference in temperature between the two 

 needles arose wlien the current of air passed through, it had to 

 be assumed tliat this would be also the case wlien living seedlings 

 were present. The deflection found in that case would have to be 

 attributed partly to this physical cause, partly to generation of heat 

 which actually took place in germination. It was therefore necessary 

 to subtract from the deflection found in this arrangement the amount 

 of deflection found in the experiments with dead seedlings, the 

 remaiuder then being the measure of the heat generated in germination. 

 This latter was observed at different temperatures and in different 

 stages of germination. In consefjuence of the complications mentioned 

 higher up the sources of error were relatively very numerous and 

 this was especially noticeable in the few parallel-detei-minations 

 which were carried out, so that in the values summarized in the 

 table below an approximation to the amounts of heat given of!" 

 must be expected rather than an exact measure thereof. These 

 influences are proportionately very large in the lower values. 



Number of calories given off per hour calculated per kilogram 

 ' of the initial weight. 



It appeared therefore from the values found that the generation 

 of heat on the 2'"^ and 3'^' days was still suuill in comparison to 

 that in later stages of gei'iniriation. The generation of heat shows 

 a great and sudden increase lietween the 8"^ and 4''' day and it 

 is probable that it continued to increase slowly during the following 



