150 NOTES AND COMMENT 



Prof. Edward J. Riissel, Director of the Rothamsted Experimental 

 Station, Harpenden, England, has prepared a new edition of Soil Con- 

 ditions and Plant Growth. The first edition of tTiis work (see review 

 in The Plant World, Vol. 16, p. 97) has taken an important place 

 in the literature of pedology, and the publishers (Longmans, Green and 

 Companj'^) are performing a service in keeping it abreast of cm-rent 

 work. Numerous minor changes and additions have been made, and 

 a chapter has been added on The Relationship between the Micro- 

 organic Population of the Soil and the Growth of Plants. 



The eighth edition of Goff's Principles of Plant Culture has just been 

 issued, revised by Prof. J. G. Moore and Prof. L. R. Jones (The Mac- 

 millan Company). This useful book adheres rather closely to its 

 former scope and treatment, being an elementary presentation of prac- 

 tical plant physiology and of the management and propagation of 

 economic plants. The physiology in this edition appears to be sound 

 and up to date, in spite of the tendency to state that "nature pro- 

 vides" for this and that. 



A semi-popular manual of the trees of Texas has been prepared by 

 Dr. Isaac M. Lewis, of the Univesity of Texas (Bull. Univ. Tex. 22, 

 1915). Over 200 native species are described, and many of these are 

 illustrated. The bulletin is in no sense a critical taxonomic review of 

 the Texan silva, and it contains very little fresh information as to the 

 distribution and ecological behavior of the trees, but it will nevertheless 

 be a very useful i^ublication both in and out of Texas. 



Mr. E. A. Goldman, Dr. H. H. T. Jackson, and Mr. Walter P. Taylor, 

 of the Biological Survey, have left Washington for the San Carlos 

 Indian Reservation, Arizona, and will be engaged during the summer 

 in a continuation of the field work in animal and plant distribution 

 which has been in progress in that state for several seasons. 



