BOTANICAL GAZETTE, 13 
The Chlorophyll Bands of Spirogyra.—In some cases it is desirable to 
count the number of chlorophyll bands in each cell of a filament of Spirogyra. 
When the band is single or double there is no baum but when the filaments 
are crowded with,chlorophyll the task is not so easy. While studying Spirogyra 
Mr. O. F. Dragoo, of the class of ’86, Purdue piston devised a novel and 
certainly very ingeni- 
ous plan, which ma 
be explained by refer- 
ence to the accompany- 
ing diagram. 
Select any band, as 
ab, and focus on its pro- 
file, as at a. Follow the 
band to the opposite side of the cell where it is again seen in profile, as at b. 
Fix the points a and 6 in memory, focus on the upper surface of the filament 
and count the number of bands between a and 8, in this case three, ed, ef, gh. 
This number, increased by one, the one first examined, will be the number of 
distinct bands in the cell. - C.R.B 
fa 
. Diagram of the chlorophyll bands in a cell of Spirogyra. 
EDITORIAL NOTES 
HE PHILADELPHIA ACADEMY oF Sciences is building up a very fine 
herbarium, claiming now to possess probably one-half the known species of 
, labeled, a 
matically air, and this great ple s being done Bratnitonsly ie the per- 
f ed 
. ALLEN, in 4 ibe Torr ae Bulletin for Oetoker and Nov ember, gives 
me notes on n the pete species of Tolypella, accompanied by six plates. A 
= to the species is given and six new species des d. 
In tHe DecemeBer number of the Gar mages 8 + Moy is given an Speeze 
of a lecture by Dr. J. T. Rothrock upon “Am n Forestry.” The went 
is made that, so far as the Jumbering produ a is E cncaraed, Mi Make ranks 
first, followed by Pennsylvania, Wisconsin, and Ne ork, and far d t} 
list stand Oregon and Washington. If the fi . see Pennsylvania are reves 
as in the past, the lecturer estimated that h less than fifty years they 
would be peered, ae it is urged tha ea shontl be viata at ast « as fast 
as they are cut 
Pro fg arcs Y, in the December Naturalist, describes a new species o 
Scie deste ing fungus, under the name Entom« mopthora ptenit. Itoccurs as a 
pi olored” a in the body cavity and femora of the common locust, Calop- 
tenis differenti 
acne CAN JOURNAL oF Sctence for December, Dr. Gray gives 
quite an elaborate review of De mrss sl ‘ Nouvelles sonyilinal sur la No- 
menclature a 4 vis for those who either can not = or do not have 
the original wil a convenient sabstivte for a translation 
