149 



A key to the common winter trees about Milwaukee which is 

 not so local as the title indicates appears in the April School 

 Science and Mathematics. The author, I, N. Mitchell, has made 

 the key simple enough for high school pupils. 



Dr. John M. Coulter has an article on teaching botany in the 

 April School Science and Mathematics in which the current con- 

 ditions are discussed under the headings of the prepared teacher, 

 economic botany, biological grouping, and the point of interest. 



The April Joiwnal of the Nezv York Botanical Garden contains 

 three illustrated articles which will prove interesting to the general 

 reader : one on the fern collections of the Garden by Ralph C. 

 Benedict, another on East Indian economic plants written by 

 Percy Wilson, and an account of some experiments on the effect 

 of the soil of the Garden hemlock grove upon seedlings by Wini- 

 fred J. Robinson. 



Viewing the government as a teacher, Mr. L. B. Stowe, in the 

 Outlook for April 17, enumerates the scientific principles demon- 

 strated within the past few years, and gives interesting concrete 

 illustrations. Those of special interest to us are connected with 

 forest and staple crop protection and with improved methods of 

 farming, such as following the contours of the hill in plowing 

 a hillside instead of plowing straight across the slope. 



The April Plant World contains two papers which were read 

 at the Baltimore meeting of the American Association for the 

 Advancement of Science : one on overlapping habitats as observed 

 in Mexico by Francis E. Lloyd ; and another by W. M. Crocker 

 and L. I. Knight on the effect of illuminating gas upon the flowers 

 of both cut and growing carnations, and the losses sustained by 

 flori.sts through defective pipes, even where chemical tests failed 

 to reveal the presence of gas. 



The University of Colorado has recently issued a botanical 

 number as the first number of its sixth volume of studies. The 



