479° BOTANICAL GAZETTE [JUNE 
Dr. HOLLRUNG’ has just published his third annual report on plant path- 
ology. This report does not differ in its essential features from the two that 
have preceded it. The work covers the ground that has been done along the 
various lines of plant pathology in different countries during the year Igoo, 
_and is divided into a general and a special part. The general part brings 
together (1) the progress made in the organization of plant protection, (2) the 
laws and ordinances relating to the protection of plants, and (3) the relation 
of plant diseases to the weather, methods of the dissemination of diseases, the 
influence of diseased plants upon man and other animals, etc. The special 
part of the report embraces the work done in 1goo in determining the causes 
of plant diseases and the means of combating them. The causes of plant 
diseases are considered, first from the standpoint of injuries from various 
sources without reference to the host plant, and second the causes of injury 
to different host plants. Under the former subdivision mention is made o 
destructive animals, such as field mice and marmots, and the means employed 
in destroying them ; of injurious insects, their development and their control ; 
and of weeds and the means used for their destruction. Under the second 
subdivision the host plants considered are grains, fodder, sugar beets, white 
_ potatoes, sweet potatoes, pod fruits, truck crops, garden products, seed and 
S ‘stone fruits, berries, grapes, timber, tropical plants, and ornamentals. The 
_methods — 
e report covers about in pages, the major ¢ por- 
aE This is followed = about go pager 
Neuerungen und Leistungen -< 
Pp. vit Berlin: : ‘Paul 
