342 BOTANICAL GAZETTE [NOVEMBER 
Some data in regard to this point are presented. While this is a preliminary 
paper, the results obtained and the statements as to methods of attack on a 
problem of this kind are suggestive to workers in this field.—S. V. Eaton. 
Response of apple trees to nitrogen fertilizers -—Nitrogenous fertilizers 
‘nitrogenous fertilizers causes increased setting of apples, accompanied ad an 
increased nitrogen content of the spurs. In the case of non-bearing trees, 
increased vegetative growth is caused. Different kinds of quickly available 
fertilizers had much the same effect. At the time of fruit bud differentiation, 
the spurs of the spring fertilized trees showed less starch than the spurs of the 
check trees, so that the spring application of nitrogenous fertilizers would not 
be expected to favor this process. The accumulation of nitrogen in the spurs 
just before growth starts in the spring is the greater the later the nitrogenous 
fertilizers have been applied the preceding season. It is a pleasure to see the 
horticulturists thus attacking the fundamental problems of their subject.— 
S. V. EATON. 
Vegetation of Illinois.—The recent publication of the 14th annual volume 
of the Transactions of the State Academy of Science"S shows about one-third of 
the volume devoted to ict of botanical and lent scological studies. sce 
State Forester, R. B. MILLER 
of the southern portion of the state, and in collaboration with Geo. D. FULLER 
examines in some detail the conditions of tree growth and the forest types 
existing in a portion of Alexander County. W. G. WATERMAN makes a pre- 
liminary report on the bogs of the northern portion of the state, while W. B. 
RENICH contributes a study of growth as related to size of seed, and A. B. 
REAGAN has some interesting ape on sig a aa of the Bois Fort Indian 
Reservation, Minnesota.—GEo. ULLE 
Mosaic disease of tobacco.—PaLm” has investigated the mosaic disease 
of tobacco, and has reached the conclusion that it is due to a causal organism. 
*s Hooker, H. D., Certain acy of apple trees to nitrogen Sma of dif- 
ferent kinds and at different seasons. Mo. Agric. Exp. Sta. Res. Bull. 50. 1-18. 1922+ 
© Transactions of the ek State Academy of Science. npc annual 
meeting. 1921. 14: pp. 326. 1922. 
7 Pat, B. T., Is the mosaic disease of tobacco a chlamydozoonose? English 
translation by P. G. Wison. Bull. Deliproefstation Medan-Sumatra. no. 15- 
pp. 10. 1922. 
