66 BOTANICAL GAZETTE [JULY 
bibliography of these diseases nearly up to date. The first edition appeared 
in 1893 and the second in 1897. It does not assume to be a complete bibliog- 
raphy, but a reference list ‘‘to enable the practical observer of plant dis- 
eases to ascertain what are the principal sources of information regarding the 
specific cause of a certain disease and the method of prevention as recorded 
in the publications of our own Department of Agriculture and of the various 
state experiment stations.” As in the previous editions, the host plants are 
arranged alphabetically under their common names. A number of diseases 
formerly ascribed to parasitic organisms but since shown tobe due to other 
causes are omitted, while many new host plants whose diseases have been 
studied in this country only in recent years are added, making the list now 
somewhat longer than before. The work is exceedingly useful not only to 
the practical worker but also to the specialist.—ERNsT A. BESSEY. 
THE ZYGOSPORE OF SPORODINIA was studied six years ago by Léger, 
who found that both gametes contain hundreds of small nuclei which become 
scattered in the mingling cytoplasm when the membrane separating the 
gametes breaks down. The nuclei near the periphery are much smaller 
than those nearer the center. At a later stage all the nuclei disappear, and 
at each pole of the zygospore there is found an “embryonic sphere” contain- 
ing a large number of granulés. The spheres increase in size and fuse with 
each other, and soon afterward numerous nuclei again appear. Gruber” has 
examined Sporodinia, and he also finds a large number of nuclei in the zygo- 
spore. The nuclei are more numerous at the periphery, but those at the 
periphery and those at the center are approximately alike in size. This 
condition persists for a long time, and subsequent stages were hard to follow. 
No fusion, division, or disorganization of nuclei could be established with any 
certainty. The presence of “embryonic spheres” is regarded as doubtful. 
n germination the nuclei appear in greater numbers and pass into the germ 
tube. Although the writer was not able to observe any fusion of nuclei, he 
believes that a fusion of nuclei at the center of the zygospore is very probable. 
—CHARLES J. CHAMBERLAIN. 
THE EFFECT of fungicides upon the foliage of the peach is discussed by 
W. C. Sturgis in a recent report of the Connecticut Agricultural Experiment 
Station.” The experiments were made with various strengths of Bordeaux 
mixture, with a soda-Bordeaux, in which soda replaced the lime, with 
ammoniacal solution of copper carbonate, with copper acetate, and with 
potassium sulfid. The Bordeaux mixture was found to be injurious to the 
*7 GRUBER, EDUARD: Ueber das Verhalten der Zellkerne in den Zygosporen von 
Sporodinia grandis Link. Ber. d. deutsch. bot. Gesell. 19: 51-55. f/. 2. 1901 
SturGis, W. C.: Peach-foliage and fungicides. Report of the Connecticut 
Agricultural Experiment Station for the year ending October 31, 1900. Part III, pF- 
219-254. pls. 3-5. 1901 
