410 The Botanical Gazette. [September, 
BRITTON, N. L.: Notes on the ninth edition of the London 
Catalogue of British Plants.—The author compared the num- 
ber and character of the changes in generic names in this edi- 
tion with those of the ‘‘check list” of American plants, stat- 
ing that only three per cent. differed, in all other cases the 
oldest name being accepted. 
HOLFERTY, GEORGE M.: Pressure, normal work and SUr- 
plus energy in growing plants.—Mr. Holferty first discussed 
the pressure exerted by roots when they meet an obstacle, 
showing that if the growing part is free this pressure begins 
at once, that the pressure increment sets in with its full amount 
at once, and that it reaches a normal maximum. In stems, 
on the contrary, pressure begins only after a latent period of 
half an hour, the pressure increment is an increasing quantity 
at first, constant for a short time, and finally a decreasing 
quantity for a long period. It was shown, second, that the 
surplus energy of plants is high when compared with norma 
work. The average ratios are, in the laboratory 21.8:1, in 
the greenhouse 5.5:1, and in the garden 4.6:1. pes 
plants show a capacity of lifting weight of nearly 400™ per 
Sq. mm. of cross section. 
z. 
COVILLE, FREDERICK V.: Botany of Yakutat Bay, An 
This paper embodied a report upon a collection of plants ma * 
at Yakutat bay by Frederick Funston, in 1892, with a genere 
account of the relation of plant life to environmental condi- 
tions and to native industries. 
MONDAY MORNING, SEPTEMBER 2D. 
The morning session was a joint session with Section F. 
ARTHUR, J. C.: 
acters from the m 
The following de 
