106 THE PI.ANT WORI^D 



find them exceptionally good and useful. For information address the 

 publisher, at Lowville, N. Y. 



The following literature will be very useful to those teachers who are 

 planning for their spring field excursions : 



Robison, C. H. " Outlines for Field Studies of Some Common Plants." 

 Published by the author, Oak Park, 111. 25 cents. 



Caldwell, Otis W. "A Laboratory Manual of Botany." New York: 

 D. Appleton & Co. Chapter IX, dealing with the examination of 

 plant societies. 



Bailey, L. H. " Lessons with Plants." New York: The MacMillan Co. 

 Has good suggestions on making collections which will mean some- 

 thing. 



A USEFUL pamphlet upon the economic aspect of algae, as related to 

 water supply, is separately printed from the Year-book of the U. S. De- 

 partment of Agriculture for 1902. It is entitled " The Contamination of 

 Public Water Supplies by Algae," by George F. Moore. 



Another interesting paper is by Julia W. Snow, " The Plankton Algae 

 of Lake Erie." (U. S. Fish Commission Bulletin for 1902, pp. 369-394.) 

 Both papers are well illustrated with colored plates. 



School Science, March, 1904, contains a report of a discussion of the 

 College Entrance Requirements in Botany of the Middle States and 

 Maryland Association of Schools and Colleges, which took place at the 

 meeting of the Biology Section of the Central Association of Science and 

 Mathematics Teachers. It is gratifying to note that the sense of the 

 speakers was generally favorable to the outline of the committee. 



Book Reviews. 



New Elementary Agriculture. By C. E. Bessey, Lawrence Bruner, 

 and G. W. Swezey. Pp. x + 194, illustrated. Lincoln, Neb.: The 

 University Publishing Co., 1904. 



This little book is one of the many indications that, at the present 

 time, the nature study of rural schools should, in the opinion of many 

 educators, be made to take the direction of elementary agriculture. It 

 is especially intended to represent that fair amount of knowledge which 

 a teacher in Nebraska holding a second or higher grade county certificate 

 should have, and as such receives the endorsement of the Hon. James 



