Mr. Walter Elder, of Philadelphia, makes the very good point that the knowledge obtained from long experience and close study of the laws of health in vegetation, is deserving of as much pecuniary reward as, at least, the knowledge required for sick animals. There should be physicians of trees and flowers, as well as doctors for horses, cows, dogs and cats. And we have no doubt that people would be just as willing to pay for good advice for a valuable plant as for a valuable animal, if only those who have the knowledge would charge for their advice and services. There is Mr. Elder himself, for instance, who has for so many years contributed of his knowledge freely to so many periodicals, could render valuable assistance to his Philadelphia amateur friends in this way. There is no reason why he should not be consulted and paid for his advice. We have no doubt it would be well worth the small fee he would charge.