1885.] On the transpiration-stream in cut brandies. 



349 



little effect, while the second cut produced a great depression 

 followed by slight amount of recovery. 



In the second series of experiments, also made on Portugal 

 laurel, both the sawings were made at one time. It will be seen 

 that here again a considerable diminution in the absorption of 

 water occurred, followed by a certain amount of recovery. 



The case of branch H is instructive ; the two saw cuts were 

 not made either quite parallel or quite deep enough, so that they 

 did not completely overlap, consequently the effect of the double 

 sawiner was much less than in the other cases. 



Exp. 21. 



Before discussing the experiments, a possible source of error 

 connected with them must be pointed out. It is clear that the 

 action of the potometer depends on the apparatus being air- 

 * Not parallel and therefore not across. 



24 2 



