104 BOTANICAL GAZETTE [FEBRUARY 
lumina of the vessels. No streaks could be observed above the dead 
part, as is the case in stems on which steam is used. Apparently 
Fics. 2, 3.—Fig. 2, photograph of a plant which has had a portion of the stem 
killed with 95 per cent alcobssl: stem split lengthwise in order to show the appearance 
of the dead portion; dead cells appear black in photograph; parenchyma cells almost 
entirely disintegrated; this figure also shows the healthy crown of leaves and sev veral 
new branches which have dev — since the treatment and which were still growing 
at the time when the stem was cut; fig. 3, photograph of a plant 63 days after 1o cm. 
were killed with CuSQ,; incasing tube into which the poison was poured still in place; 
darkened, shriveled stem seen through glass tube surrounded with a plug of cotton; 
crown — several leaves still in good condition and the growing branch in centet 
still turg 
the oe would have remained alive and the stem have continued 
to conduct sap as long as the injured portion was protected. The 
dead portion fell to pieces when exposed and touched. From this 
