161 
ing, could find no fuel except roots of sand cherries exposed along 
fresh “ blow-outs.” 
Discussion by Dr. Allen, Mr. Wooton and Dr. Rusby followed 
relative to the loco-weed poison. Mr. Wooton said that Spresia 
Lamberti is the chief /oco-weed about Flagstaff, Arizona, that cat- 
tle men claim that the well-fed animal will not touch it, but that 
those which have formed the taste will not eat anything else. 
Reasons were urged by the speakers for the belief that the results 
of the /oco-weed are due simply to mal-nutrition, or to effect of 
seeds alone, or to a poison (as extracted by Sheldon) diffused in 
very minute quantities throughout the plant. 
3. By Dr. H. M. Richards “On some of the Reactions of 
Plants toward Injury.” 
Dr. Richards spoke on certain effects of wounding upon the 
functions of various plant organs as shown by his own experi- 
ments in Germany last summer. Diagrams illustrating the effect 
of injury upon both respiration and temperature were shown. In 
the former case it was seen that the respiration is greatly increased 
by wounding, attaining its maximum about 24 hours after the in- 
jury was inflicted, this increase depending both on the stimulus of 
the wound itself and upon the access of atmospheric oxygen to 
the tissues. The occurrence of a corresponding rise in tempera- 
ture of a local nature, was also briefly referred to, the tempera- 
ture curve corresponding closely to that described by the increased 
respiratory activity. The thermoelectric apparatus used was de- 
scribed, its delicacy is such as to indicate a difference of x}, of a 
degree, the result with potatoes showing a maximum rise of tem- 
perature of a little over ;7; of a degree at the end of the second 
day, falling to the end of the fifth day. A remarkable tempera- 
ture rise in the onion of nearly 314 degrees was explained by the 
fact that here the rise was not local, but affected the whole onion 
in accordance with its morphological structure, and with the fact 
that metabolism is carried on very fast in the onion. 
The paper was discussed by Dr. Jelliffe and by Dr. Britton, 
especially with regard to the sudden escape of CO, after wound- 
ing, Dr. Richards considering it to be due largely to contents of 
intercellular spaces, but partly to solution within the cells; pota- 
toes contain a very considerable amount of enclosed CO,, a quart 
