FRANCIS WILLUGHBY. 85 



asserted, that the main body of the sap being not 

 returned to the point whence it was propelled, 

 like the blood to the heart in animals, the term 

 circulation of the sap, in the sense of its passing 

 round in the same track, its motion constantly 

 tending to the same point from whence it began, 

 is not proved to be appropriate.* Mr Willughby 

 also communicated many other papers during the 

 same year, containing observations which he 

 himself made on the black poplar, the dwarf 

 oak, &c. 



In the month of July, 1670, Dr Edmund King 

 had communicated to the Royal Society some ob- 

 servations he had made on certain insects lodging 

 themselves in old willows, curiously wrapt up in 

 green leaves, in channels or burrows, each with 

 twelve, fourteen, or sixteen leaves around the 

 body, and several of them having as many little 

 round bits of leaves at each end to stop them up 

 close ; which, thus made up, were near an inch 

 long, put in one after another into a bore made 

 in the wood fit for their reception, " resembling 

 cartrages in powder wherewith pistols are wont 

 to be charged, or like long slugs of lead ; some 

 placed so near as to touch, and others at a con- 

 siderable distance, in burrows like those of 

 rabbits. 1 ' 



The following are extracts from two letters by 

 Mr Willughby to the publisher, from Astrop, 

 August 19, and from Middleton, September 2, 



* Rees's Cyclopaedia ; article, Circulation of the Sap. 



