ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
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trichum Persicse sp. n. The fungus does not invade the tissues, but 
the superficial growth prevents the development of the peach at these 
areas. A. L. S. 
Factors affecting the Production of Apothecia of Sclerotinia 
cinerea. — Walter N. Ezekiel ( Phytopathology , 1921, 11, 495-9). 
From experiments the writer lias proved that burying mummies (fruit 
rotted by Sclerotinia ) inhibits the production of apothecia even if the 
development of the apothecia has begun before the fruits are covered 
by the soil. A. L. S. 
Anthracnose of the Garden-Pea. — Fred Reuel Jones and R. E. 
Vaughan ( Phytopathology , 1921, 11, 500-3, 1 pi., 2 figs.). The disease 
which attacks the pods is due to the fungus Golletotrichum Pisi , which 
has appeared lately in Wisconsin. Cultures have been made of the 
spores, and plants have been inoculated successfully. A. L. S. 
Leaf-spot Disease of Tobacco. — Frederic A. Wolf ( Phyto- 
pathology , 1922, 12, 99-101). The spots were caused by the fungus 
Phyllosticta Nicotiana , brownish zonate spots irregular in outline, varying 
in size from 1-10 mm. Descriptions of the fungus are given and of 
inoculation experiments. The disease attacks not only seedlings but 
also mature plants. A. L. S. 
Banana Freckle in the Philippine Islands. — H. Atherton Lee 
(. Phytopathology , 1922, 12, 101-2, 1 fig.). The freckling of the bananas 
is due to the presence of black spots on the surface of green and also of 
mature fruits. On the spots occur pycnidia resembling Phoma musse. 
The disease is widespread in Oceania. A. L. S. 
Sclerotinia minor sp. n. Injurious to Lettuce, Celery and other 
Crops in the United States. — I. C. Jagger ( Journ . Agric. Research, 
1920, 20, 331-4, 1 pi. ; see also Bull. Agric. Intell. Rome, 1911, 12, 
647-8). The fungus caused destructive rot of the growing plants, 
producing the same effect as the species Sclerotinia Libertiana , but with 
smaller sclertia and a much more rapid rotting of the host plant. It 
has been found that many plants are subject to attack. A. L. S. 
Biochemistry of Plant Diseases. — J. J. Willaman and W. M. 
Sandstrom (Bot. Gaz., 1922, 73 , 287-307). The writers have studied 
in this paper the effect of Sclerotinia cinerea on plums. They considered 
that the host might contain or produce repellent substances, such as 
tannins, acids, antienzymes and antibodies, or that the host might fail 
to furnish the proper kinds and amounts of nutrients for the normal 
development Of the fungus, and therefore they attacked this problem of 
resistance and of susceptibility from the standpoint of the parasite. 
The cultures and chemical analyses are carefully recorded. They note 
that when the fungus rots the plum some well-marked changes in com- 
position took place in the tissues ; the juices showed decrease in specific 
gravity, in true acidity, a decrease in titratable acidity of greater 
magnitude than the decrease in true acidity, and an increase in oxalic 
acid content. The fungus prevents the usual formation of tannin in 
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