BOTANICAL GAZETTE. 307 
ally covering one side of a secluded pe and quite out of reach. Is this not 
an early date for it?—W. W. BarLe 
The Torsion of Leaves.—The sepia is the substance in tabular form 
ofa paper read before Section F of the ss. Ad. Sci. at its Philadelphia 
meeting, by Prof. W. J. Beal, of the pe elise College, i cao In the 
Case of plants whose leaves are not erect they are supposed to when the 
direction of twist is given. 
Su [om SZ 
O- o_: & 
NAMEs oF P: ou Sane 5S 
LANTS, re = 3 25 Direction of Twist. ¢ o REMARKS. 
Ba g\238 Z5 
Che: i 
nopodium album Indifferent A Structure of both surfaces 
alike: % more stomata 
Typha latifolia Sev’l at ney er. Kee og nighen 
1000 |All with the sun...... 14-2 Pca tn alike. 
‘rp 300 |All with the sun......|... 2’... (Structure alike. 
75 |All with the sun...... 1 - 
ne “ wid less. Lt osled peien chiwie'd 
Ww t 
Cus iment a Se ee ae 
st with thesun iy 
va porrum... Rese eas Le BPRS aes a hy the sun...... ing 
s n CTOT Corsecesesseceee ‘o~. 
Speciosa..... Most with the sun....)1 oF : 
three oth sai 
Giad er x nracse Indifferent... seeeaeees 
lolus, cult.,vars....| “850 |......... Allagainst the sun... 4 [Stru otare alte. AP Twist 
Liatris seariosa,....... ) 192 ae 179 with the sun if tae gihectore aimee: stomata 18 
sae 18 against the sun. on ox to 12 on u = 
Phleum oe Twist greatest near 
pra MEMO btiaais GO wake. All with the sun...... cine 
ee 20; |. an | 439 ee calf 
He tum Ttalieum......... 4 All vo io leaped i Seedlings. 
pus lan lanatus pans # he sun Seedlings. 
“a an al {tons plants, 
rade 
Caweon ates 
Triticum eat 
tio 
Seg author concludes that the conflicting facts observed do not furnish 
a tisfactory clue to the cause of torsion. Similar variation has been o 
rystegia sepium, The twisting of the 
in = ie be of advantage to the plant in rendering the leaf more rigid and 
light ng both sides to be exposed throu gh part of the length to direct sun- 
. Zopts Classification of the Bacteria.—The following sree, of 
pe eria by Zopt is probably the most peers: one yet pro The 
are distributed into four groups, a8 follo 
a 
Coceacer, Possessing (as far as our oe knowledge reaches), only 
