270 THE JOURNAL OF BOTANY 
Ar the same meeting, Mr. H. H. W. Pearson read a paper ‘On 
certain species of Dischidia with double pitchers,” illustrated by 
specimens and lantern-slides. He stated that four species of 
her of D. Rafflesianum 
hangs free in the pitcher. The outer pitcher of the double-pitchered 
forms contains solid matter and roots. Ants were present in two 
n 
t fr 
D. pectenoides a large number of small, irregularly shaped sweet 
masses are present in the inner pitcher; these arise from 81S 
mycelium is present on the surface of the inner wall of the outer 
— the hyphe of which abstrict gemme which perhaps serve 
0 
Leaf Disease in Plums and other Prunew.” The peculiar ashy-gtey 
colour of the leaves of trees suffering from the so-called ‘‘ silver- 
leaf’? disease is due to the development of intercellular spaces just 
beneath the cuticle of the leaves. The chloroplastids and other 
parts of the tissue of the leaves are very little different from those 
rmal specimens. The author f 
affected plant, is conducted through the stems to the leaves. 410% 
Percival showed specimens of branches which he had artificially 
e 
0 
the infection-wound upwards along the branch much more rapidly 
th wnwards, and only along the side on which the wound was 
made were the leaves diseased at first, though the trouble now 
appears to be spreading to other leaves and spurs off the line drawn 
from the wound to the tip of the inoculated branches. Prof. 
Percival also gave an account of some observations upov the 
distribution and first appearance of crystals of calcium oxalate 12 
Alsike (Trifolium hybridum Linn.) grown under various conditions: 
Tue U.S. Department of Agriculture has issued a bullet 
entitled The Algerian Durum Wheats,” the work of Mr. U:-\° 
Scofield, expert on cereals. The grain of Triticum durwm, whick 
fi 
has a hard horny endosperm, is used chiefly for the manufacture © 
macaroni and similar paste foods. The bulletin deals wit 
