1893.] American Association of Agricultural Colleges. ae 
having threads from 9u to 11Min diameter and 1004 to 200 in 
length, colorless at first, finally becoming brown. The fungus 
was isolated and grown in acid nutrient agar. Plants grown 
in sterilized soil when inoculated with this fungus dropped 
over and had this characteristic fungus. The same fungus 
was obtained from the inoculated plants. The author con- 
cludes that probably much of the damage attributed to Pyth- 
tum is caused by this fungus. ‘ 
L. R. JONES: The antagonistic relations of certain potato 
diseases.—Three diseases have been observed in Vermont, (I) 
blight and rot, (Phytophthora infestans); (2) the macrospor- 
ium disease; (3) a bacterial disease. The phytophthora dis- 
ease, and the macrosporium disease, or a disease associated 
with Macrosporium has been very common in Vermont in 
1890, 1891 and 1892. He has watched these diseases and 
noted that there is an annual struggle between them. ‘‘It is 
comparatively rare that a tuber affected by the characteristic 
dry rot of Phytophthora is found among the tubers where the 
vine is destroyed by the new disease.” The author concludes 
that if the climatic conditions remain as they have during 
the past three years in Vermont and only early potatoes are 
planted, the new disease would tend to exterminate the Phy- 
topthora. 
L. H. PAMMEL: Preliminary notes on a rutabaga and 
turnip rot.—The disease is not associated with any of the 
higher fungi, but there are present in the tissues numerous | 
bacteria. Cultures of several species have been obtained, 
and one of these apparently produces a rotting similar to 
those found in the field. The inoculated plants were in the 
field so the demonstration is by no means conclusive. More 
work is under way. A curious feature in connection with the 
disease is that the dry weather in September not only checked 
the disease completely, but such plants as had rotted almost 
entirely recovered by forming a corky layer around the 
diseased portions. ; 
- H. PAMMEL: Some experiments in the prevention of 
Cercospora Ribis and Cylindrosporium Padi.—The author 
detailed some experiments in treating these diseases with 
ammoniacal carbonate of copper, Bordeaux mixture, and sul- 
Phosteatite. Bordeaux mixture proved most effective, the 
plants having retained their foliage well into October. In 
1891 ammoniacal carbonate of copper gave good results, but 
