314 ^ EXPEKIMENT STATION RECORD. 



On the stimulating- effect of certain substances upon the growth of algae 

 and fungi, N. Ono (Bot. Ma;/. [7ok!/o], lo [luoa), X<>. HU), jiji. 7'i-7S). 



The importance of mycorrhiza, a comparative biological study, K. (^tahl 

 {.lahrh. HV.s-s. Boi., 34 {1900), Xo. 4, PP- 339-688, Jifja. ;>). 



Origin of the Basidiomycetes, G. Massee {Jour. Linn. Soc But. [London], 34 

 [1900), Xo. 240, j>p. 438-44S, pis. 2). — Notes on the murphology and affinities of tliiw 

 group of fungi. 



The nodule organism of the Leguminosese, W. (i. 8MiTn {Proc. Linn. Soc. X^ew 

 South Wdli'x, ..'4 {1900), Xo. 96, pp. 653-674, ]'/'<• ~) ■ — A history of the organism and 

 the results of the researches of the writer. 



METEOROLOGY. 



Frost fighting, A. G. McAdie {U. S. Dept. A(//'., Weather Bureau 

 Bui. "29., pp. 16, pis. 6). — This is a discussion of the methods of fore- 

 casting and protecting against frost, especially as practiced among the 

 fruit growers of California. "The experience of the past 3 j^ears 

 warrants the statement that the loss due to frosts in California, hitherto 

 considered unavoidable, can l)e prevented, and that unless extreme 

 conditions, l)y which is meant lower temperatures by 5° than have ever 

 3^et been experienced in this State, occur, the citrus fruits of California 

 can be successfully carried through the period when frost is likeU'.'" 

 It is claimed that "the formation of frost is primarily a matter of air 

 drainage,'- and fruit growers are urged to study the topography of 

 their lands with a view to locating the areas over which the air is 

 stagnant and consequently more subject to frost. 



Attention is called to the following important relation, first pointed 

 out b}' Prof. W. H. Hammon, which is useful in forecasting frosts for 

 southern California: "A wave of falling pressure passes from Montana 

 or Idaho southward across Utah and westward through southern Nevada, 

 thence into Arizona or southern California, and if followed l)v a rapid 

 rise in pressure is generally the forerunner of much colder weather in 

 the southern citrus belt. . . . The Weather Bureau office at San Fran- 

 cisco has demonstrated beyond criticism that frost can be successfully 

 forecast." A study of the frost warnings of the Bureau, with frequent 

 observations on temperature, humidity, and air motion, will enable the 

 grower to judge of the danger of frost in his particular case. The 

 methods of protection discussed are, planting with more I'egard to air 

 drainage and correcting defective air drainage by means of windbreaks, 

 etc. ; warming the air by means of small fires in Avire l)askets, snmdging 

 and the use of steam, irrigation with luiheated and with warm water, 

 spraying, and screening or covering. Many of these methods have 

 proved of gnnit practical vahu\ hut "of all methods proposed for the 

 protection of fruit, excepting wii'e l»ask(>ts. irrigation has {\w largest 

 amount of evidence in its favor." 



Prediction of frost, J. E. Bonebright {Ida /hi Sin. Bui. 23, pp. 

 lJ6-lJf2, ji[is. J). — This article discusses hrietly |)r()tection against 



