FRANCIS WILLUGHBY. S3 



the bleeding diminished about one half ; and 

 having sawed just above this hole to the same 

 depth, the bleeding from the hole ceased quite, 

 and from the sawed furrow below decreased one 

 half; and it continued bleeding a great while 

 after at both the sawed furrows, the hole in the 

 middle remaining dry. We repeated this with 

 much like success upon a sycamore." 



" Some trees of the same kind and age bleed a 

 great deal faster and sooner than others, but 

 always old trees sooner and faster than young." 

 " A wound made before the sap rises, will bleed 

 when it doth rise." " While making these 

 experiments, the weather changed from very 

 warm to very cold ; whereupon the bleeding in 

 the birches, which began to abate before, ceased 

 quite. But all the sycamores and walnut trees 

 we had wounded bled abundantly, (some whereof 

 before bled not at all, and those that did so but 

 slowly,) and so continued night and day when 

 it froze so hard that the sap congelated as fast as 

 it issued out. The cold remitting, the birches 

 bled afresh, the sycamores abated very much, 

 and the walnut trees quite ceased." 



" We pierced two sycamores on the north and 

 south sides of them, and both, from equal inci- 

 sions, bled a great deal faster from the north sides 

 than from the south." 



These communications to the Philosophical 

 Transactions induced many others, especially 

 one written by Martin Lister, Esq. touching 

 some inquiries and experiments on the motion of 



