THE FERN BULLETIN 



93 



erogeneous grape fern group. It seems apparent, how- 

 ever, that botanists have not yet unraveled the mys- 

 tery at the bottom of the variation in BotrycJiium. In 

 no other group of plants does there appear such reg- 

 ular and constant variation. Starting with the small- 

 est simplex one can pick out a series of specimens that 

 will almost imperceptibly grade into any other given 

 species. Our naming of species and varieties in this 

 group, then, is largely an attempt to describe certain 

 forms and conditions which the BotrycJiium alliance 

 may take, and each has a right to his own conception 

 of these things. 



BOOK NEWS, 



The fifth, and concluding part, of Grout's "Mosses 

 with Hand Lens and Microscope" has recently ap- 

 peared and the parts bound in one volume are now of- 

 fered at $7.00. 



"Our Garden Flowers," by Harriet L. Keeler is a 

 popular work recently issued by Scribner's which de- 

 scribes the common cultivated plants and gives more 

 or less information about them. 



Chas. T. Druery, author of several works on British 

 ferns has issued a new volume entitled "British Ferns 

 and their Varieties," In addition to the text there are 

 40 colored plates and many other illustrations. 



Greene's "Among School Gardens," published by 

 Charities' Publication Committee, New York, gives 

 a resume of what has been done in the movement to 

 make school gardens a practical part of education. 

 The book has many illustrations of real gardens and 

 will be of great value to teachers in charge of such 

 courses. 



