In an article on " Pear Blight," in the Report of the Botanist to the New York Experimental Station, Prof. Arthur sensitively says:

"There is something remarkable in the slowness with which the essential and fundamental truths upon which the bacterial explanation of pear blight rests, are grasped by this part of the public. This is brought forcibly to mind by an item in the last number that has come to hand of a leading horticultural journal, which says ' the germs of these low orders of vegetation exist everywhere; . . . inoculation of a healthy subject is not demonstration; ... if any other demonstration has been offered it has not come under notice,' etc. If the leaders among horticulturists can come so far short of appreciating the bearing of the facts which demonstrate that specific bacteria cause pear blight, it cannot be amiss to briefly go over the argument again.