The point we made recently, that scientific men who are aiding us by their researches in discovering the causes of plant diseases, do not render us the service they might, because of confusion in identifying what cultivators refer to. What they call "pear blight," for instance, is not in many cases, the terrible foe, "fire blight;" and hence when they tell us that they have experimented and found that "bacteria" is the cause, we are left in uncertainty as to whether they mean just what we do.

This is again impressed on our attention by the essay of Prof. Arthur before the American Pomological Society, as reported in the Country Gentleman. It is very evident that the diseases or disease he has been grappling with, and which has been reproduced by inoculation, is not the " fire blight," as many of us understand it; and this leaves the question of the origin of the "fire blight" still an open one.

In a letter to the Country Gentleman, Mr. Charles Betts, of St. Joseph's County, Michigan, confirms this conjecture, that the "Pear Blight," on which Prof. Arthur has made such careful experiments, is not the old "fire blight" which is the great worry of the Pear grower.