434 BOTANICAL GAZETTE [JUNE 
PRIANISCHNIKOW"? presents a preliminary report of sand culture experiments 
which extend his investigations of 1g00 on the relative value of different phos- 
phates in plant nutrition. As in the earlier work he found ammonium sulfate 
to be a “‘physiologically acid” salt, so now he = contrary to all expectations, 
that ammonium nitrate can also function as a ‘physiologically acid” salt. This 
peculiar acidity is much less in the case of ammonium nitrate, however, than in 
that of ammonium sulfate. The phrase “physiologically acid” is used in the 
sense suggested by ApotpH MEveER as applied to a salt whose basic group is 
more rapidly appropriated by the plant than its acid group.—RAymonD H. Ponp. 
WorsDELL’”° has discussed the meaning and origin of the phenomenon ordi- 
narily called fasciation, including not merely those abnormal appearances to 
which the term is ordinarily applied, but also ‘“‘normal fasciation”’ as exemplified 
by such stamen clusters as appear in Hypericaceae and Malvaceae. His con- 
tention is that in the development of a structure there are two opposing tendencies, 
the younger being a tendency to integrity, the latter being a tendency to plurality, 
and that the condition of the mature structure is the resultant. The mechanical 
cause i. has to do with the distribution and functioning of “growth 
comtern.”——1 BT. C. 
PincHot** has published a second part of his Primer oj Forestry, dealing 
with the practice of forestry, work in the woods, and the relation of the forest to 
weather and streams. There is also a short account of forestry at home and 
a ume 
sacha elementary account of practical forestry. Such literature, prepared 
by those who have the most ample information, will do more than anything else 
to educate the intelligent public as to the meaning and need of forestry.—J. M. C. 
A GENERAL ACCOUNT of the vegetation of the island of Guam has been pub- 
lished by W. E. Sarrorp.??_ The account includes some reference to every plant 
known to occur on the island, and discusses the principal plants used for food, 
ber, oil, starch, sugar, and forage in the Pacific tropical islands recently acquired 
by the United States. The method of cultivating and propagating the more 
important species is treated in considerable detail. While the paper is somewhat 
miscellaneous as to contents, it is full of information for botanists.—J. M. C. 
9 PRIANISCHNIKOW, D., Ueber den Einfluss von Ammoniumsalzen auf die 
NEO Ss von Phansithousk sive bei héheren Pflanzen. Ber. Deutsch. Bot. Gesells. 
23:8-17. 1905. 
2° WorSDELL, W. C., “Fasciation:” its meaning and origin. New Phytologist 
4:55-74. figs. 17-24. 1905. 
2t PINCHOT, GIFFORD, A primer of forestry. Part II. Practical forestry. U. S. 
Department of Agriculture, Bureau of Forestry, Bull. 24. part 2. pp. 88. 1905. 
22 SAFFORD, WILLIAM Epw1n, The useful plants of the island of Guam, with an 
introductory account of the Shyeical features and natural history of the island, of the 
chara history of its people, and of their agriculture. Contrib. U. S. Nat. 
Herb. 9:1-416. pls. I-69. 1905. 
ESE a so eee 
