0' 2 



« 



We 



y 



.eedlc 



e 



J^irks 







■ their 

 I fup. 



>tree3 

 }vered 

 r pur- 



-^ 



i 



-> 



of the 



isim 



'7 



ar- 



3 



blood 



p.juice 

 rwar-i 



-e it '^ 

 „ along 



cover- 



ap 



hifes 





hans 



cd 



illto 



Sect. XIV. 3. 2-. 



OF PLANTS. 



349 



blood 



w 



hlch aceounts both for their exiding in all kinds of 



weather on the inferior fide of the leaves, and for their {landing with 

 thdr heads towards the foot-ftalks of them. Thus on an up 



ri< 

 twig of a plum-tree I this day obferved a number of aphifes adh 



ht 



ith their heads downwards with their probofcifes inferted into the 

 nder ftem,and fo near to each other, that the tail part of the lower 



one third of their length over the head part of thofe 



ded 



h 



or in 



above them, gnd gave fomewhat the appearance of fcales ; v 

 the hanging twigs they adhered with their heads upwards, ftill 

 to meet the ftreams of fap-juice in the afcending chyle veflels 



the pulmonary arteries. 



Dr. Bradley and others obferve, that about Midfummer there ap- 

 pears to be a paufe in vegetation, and that at this time the new buds 



^^ 



d : and Duhamel and 



found, that the bark of fe 



veral 



became at this time as eafily to be feparated from th 



burnum as in the fpring ; as is related in Se6l. III., 2. 8. of this work* 

 At this time therefore there exifts a new flow of fap-juice to fupply 



P 



fent 



nutriment, ( 

 ly generated 



furnifli 



a 



fervoir of fut 



utriment 



or expedled embryon, either before or after 

 /ification, or its impregnation, if fuch a procefs may be fuppofed 

 cur in the produ6:ion of buds. 

 At this time then, when there exifts a fummer-flow of fap-jul 



this 



pern 



fed 



d 



mi 



pierces the fap-veflels 



d the new (hoots, or the pulmonary arteries beneath th 



and thus drinks the vegetable ch\ 



fap-juice, with fuch avidity 



part with much of it again almoft unchanged 



This I now 



believe with Sauvage to be the origin of one kind of honey-dew 



tainly 



d if another kind of honey-d 



exift 



as 



h 



mentions 



where there are no aphifes, I fufpe^l, as obferved in No. i. 7. of th 

 Sedion, that it muft arife from the inverted action of the lymphat 



veflels of the leaf, at the time of the increafed quantity of fap-jui( 



3 



about 



