84 ON THE USE AND OFFICES 



" of a tree, it there meets with cold enough to 

 " condense it into a hquor, as the vapour in a 

 " still is known to do ; in this form it returns 

 '* to the root down the vessels, which do the 

 " office of veins, lying between the wood and 

 " the inner bark, leaving, as it passeth by, such 

 " parts of the juices as the texture of the bark 

 *' will receive and require for its support." 



Miller says, '* The notion of the circulation 

 " was entertained by several authors much about 

 " the same time, without any communication 

 *' one with another, particularly M. Major, a 

 " physician at Hamburgh, M. Peracett, Mari- 

 ** otte, and Malpighi : it has met, however, with 

 *' some considerable opposers, particularly the 

 " excellent M. Doddart, who could never be 

 " reconciled to it. 



'* M. Doddart, instead of the same juices 

 ** going and returning, contends for two several 

 *' juices ; the one imbibed from the soil, digested 

 " in the root, and from thence transmitted to the 

 " extremes of the branches, for the nourishment 

 *' of the plant ; the other received from the 

 " moisture of the air, entering in at the extremes 

 " df the branches ; so that the ascending and 

 *' descending juices are not the same.'* 



Mr. Knight is also an advocate ibr the doc- 

 trine of cuculation, and has published a variety 



