Prof. Farlow continues his useful labors among fungi destructive to vegetation. He has contributed to the Botanical Gazette a. list of all the fungi allied to the Perenospora infestans.the well-known source of the potato rot, that he has found in the United States. There are thirty-five in all; of these, one. P. Viticola, is found on the wild and cultivated grapes east of the Rocky mountains, as well as in Europe and Algiers. The others are chiefly found on wild plants, and have not yet assayed to plague the cultivator to any material extent.