238 Seientific Intelligence. 
go far towards showing that here, as ri long ago ed bie the 
truth is to be found between the extremes. These experiments, 
which need to be carefully repeated, indicate that under certain 
circumstances the transfer of water takes place by means of the 
opines gone but that in all cases they may serve the part 
abr rese 
oreover, ‘the ealiber and length of the vessels regulate the 
ate of transpiration ; resistance to the movement of ‘the water 
follow wing the law of Poiseuille, so that the resistance is inversely 
proportional to the fourth power of the diameter and directly pres 
portional to their length. We give in full the close of Vesque’s 
“It is evident that p having reached its maximum, that is to 
say the suction resulting from transpiration not being able to 
increase without changing our conditions, eens the air dis- 
solved in the water becomes disengaged. the quantity of water 
which arrives at the organs of transpiration across a vessel filled 
with water is expressed by or From this we can see why climb- 
ing plants have such large vessels; in fact, the increase in diam 
ter can alone compensate that of the len 1th, And, further, ‘he 
quantity of water which can pass through a ves ssel in a given time 
ears a certain relation, v varying for each species, with the water 
t contains : this, which I have called the transpiratory 
eral, A study of this apparatus very often gives the key as to 
the resistance of certain plants to certain surroundings, and per 
mits us to indicate at once the conditions under which we must 
cultivate biarcé Anatomy, I am convinced, will snag oa — 
to rational culture 
5. The stalked ‘Gviniods of the Caribbean Sea ; by P Her 
BERT CarPENTER, Bulletin - the Museum of Comparative Zo- 
ology, vol. x, No. 4, Dec., 1882.—This paper Report on 
the Dredgings of the Coast Survey aieioeois Blake, in ir the Gulf of 
BP, asterit P Milleri, P. decorus and P. Blakei (here gee 6 
Lofotensis and .R, Rawson: They were obtained at ace ths 
est limit being 2,435 — for etaess vio found by 
the Porcupine in 1869; that P. Wyoille Thomions was obtained 
y e roar in 1 ee “ye thoms in 1870 - Naresianus, at 
