78 



First, the imperative need of a natural biologic approach for 

 the presentation of rational sex hygiene. 



Second, the weakness of the attempt to teach hygiene without 

 previous biology foundation, also the impossibility of successfully 

 substituting either hygiene or general science for biology. 



Third, the moral demand upon us to supply through biology 

 courses, the working material for individual culture and philos- 

 ophy. 



Fourth, the necessity of popular biologic education to insure 

 worthy legislation. 



Fifth, the loss to the country and to the individual concerned, 

 of not discovering those whose talents and genius lie in the line 

 of biologic heritage. 



EVANDER ChILDS HiGH SCHOOL, 



New York City. 



REVIEWS 



Trelease's Plant Materials and Winter Botany* 



These two valuable pocket volumes contain a great amount of 

 clear and condensed information about trees and shrubs. The 

 former takes up 247 genera, 782 species, 1,150 forms. It is 

 intended to enable any careful observer to learn the generic and 

 usually the specific name of any tree, shrub or woody climber, 

 likely to be found in cultivation in the eastern United States, 

 except the extreme south. The concise key to genera, separate 

 for trees, shrubs, undershrubs and woody climbers, emphasizes 

 vegetative characters. In the main part of the work the genera 

 are more fully described and keys lead to the species and forms. 

 In a few genera such as Crataegus, Cotoneaster, Philadelphus 

 and Rosa, only the most easily recognized species have been 

 admitted. Trees and shrubs of the orchard are traced to their 

 species. 



The larger "Winter Botany" much surpasses any existing work 

 as a practical means of identifying cultivated trees and shrubs in 



* Trelease, William. Plant Materials for Decorative Gardening. The Woody 

 Plants. Pp. 204. 1917. Price, Si. 00. 



Winter Botany. A companion volume to the above. Pp. xi + 394. Illus- 

 trated. 1918. Price, S2.50. Both published by the author, Urbana, 111. 



