1019 



These figures refer to a compïirative experiment made in Campos 

 on transpiration in Loranthus dichrous and Psidium guajava; 

 regulation of transpiration took place regularly in the last species, 

 but in Loranthus dichrous it took a ]ioticeably irregular course. We 

 see here also that at first the amount of transpiration per unit of 

 time decreases, later distincflj increases (when the boughs have 

 lost + 5 7o in weiglif) and finally diminishes again (when the loss 

 in weight amounts to + 10 "/J. When the experiment was finished 

 at 3.9 both boughs already began to dry. 



The results of this investigation may be summarised as follows: 

 When cut leafy boughs or whole plants are allowed to wither 

 and the transpiration is followed by means of periodical weighings, 

 it is found in most plants, either that the amount of transpiration 

 per unit of time remaijis ai)proximalely constant until the bough is 

 dried up or that these amounts decrease uniformly until the trans- 

 piration is reduced to a minimum. 



In Vhtcum album and Hhipsalis Cassytha the peculiar phenomenoji 

 is observable when the same experiments are made, namely, that 

 when the bough (or phintj under investigation has lost a certain 



