( 5^^ ) 
A furthr Account concerning the Exijlence of Veias in all kind 
of Plants 5 together with a Difcovery of the Membranous fuh- 
jiance of thole Veins ^ and of (ome AUs in Plants rejembling 
thofeof Senfe ^ asalfoofthe Agreement of the Venal Juiee 
in Vegetables with the Blood o/' Animals ^Qc^ Communicated 
bjf Mr. Lifter in a Letter ofjanuar ?• i6t± and exhibited to 
tbeK, Society. . '^* 
SIR, 
T|. X 7 E have formerly given you certain reafonsior the 
V \ Exiftence of Fezm^ {'analogous to thofe in Adi- 
mals) in all Plants whatfoerer, not Mulhromes excepted 
To which we might add others of later notice 5 as the skin 
of a plant may be cut fheer off with part of the fpongy pa- 
renchjma^ arid no figns of Milky juice follow, that is, no 
breach of a vein* AgaiD,wehave ftript the Plant of its 
skin, by pulling it up by the roots, and expoling ittothe 
wet weather, untlll it bccanae flaccid as a wet thong, with- 
out any injury to the Veins^which yet upon incifion would 
frelhly bleed. Thefc Experiments^ 1 fay, make againft 
the general opinion of one only fap loofely pervading the 
whole plantj like water in a fponge. 
And though we have made thefe and many othier Ex- 
periments to facilitate an ocular demonftration of thefe 
Veins 5 yet we have not been able to tScSt it to our mind, 
and fubjed: them as nakedly to our eyi^as we could wifh, 
for a through-information of their Ufe, and a minute and 
aGCuratedifcovery of all the particular Accidents belong* 
iog to them as fach veffels. This,I fay,is a work of much 
labour and pafiencc 5 and that which renders matters very 
difficult, is the infinite number, fmallncfs and perplexity, 
of thefe Plants. 
Id the Tranfverfe cuts of Plants, we fee as it were a cer- 
tain Order and Number of the bloody orifices of differed 
veins. We obferve alfo in a Leaf, which we take to be the 
fimpleft part of a pl^nti ^ 
- I. That 
