ne Eat The Botanical Gazette. [January . 
the season was more favorable. In seasons like 1892 wi : 
bonate of copper wash off much easier then the Bordea 
mixture. 
L. H. PAMMEL: Relation of frost to certain plants. 
certain plants were killed. In several cases like castor-0 
bean the lower leaves were affected while the upper longr 
mained green. So also Zea Mays, Scabiosa atropurpure 
Marrubium vulgare, Nepeta cataria, Phlox Drummondit and — 
Cosmos are quite resistant to frost. _ 
S.A. BEACH: Bean anthracnose and its treatment.—Ith 
been known for some time that when anthracnosed seed 
planted the disease most frequently is found on the cotyledo! 
as soon as they push through the surface of the soil, but tt 
the most important and effective method of securing healt 
plants. 
lowa Agricultural College, Ames. 
BRIEFER ARTICLES. 
The use of blue-print paper in recording root eurvatures.— 
common blue print paper so much used by photographers, archite 
and mechanical engineers, is not, so far as we are aware, of freque 
use in botanical laboratories; yet it may be employed for a number 
purposes with a considerable saving of time. We have found it p 
ticularly valuable in printing the angles of both primary and seco? 
ary roots that have been subjected to galvanic currents, and also 
printing the geotropic bendings of secondary roots, to make an 
rate drawing of which would require considerable time; whereas 
exact reproduction can be obtained in a very few minutes. This 
most easily accomplished if we have either an air or water cultur 
fastening a piece of the sensitive paper to the outside of the glass 
, in which the plants are growing, and exposing them for a few mom 
to sunlight. It is better still, especially if the plants are cultivated 
cylindrical jars, to transfer them to a rectangular glass jar filled 
water, and of sufficient size as to allow the secondary roots to ® 
