92 



Rec. Sci., ii., pp. 412-423, 457-469, and iii., pp. 1-21) 

 This IS an extremely minute and laborious study of the. 

 geographical botany of Canada, with the relations of the flora of 

 various regions to that of Northern Europe and Asia. The 

 question of the origin of these floras is discussed in great detail. 

 We fail to see that any very important facts are added to the sum 

 of knowledge on this question, but the minutiae of the investiga- 

 tion are of the greatest interest. Our space forbids a proper 

 presentation of these, and we must merely refer those interested 

 to the above cited journal. 



Elements of Botany, — Asa Gray. (Revised Edition, 8vo., pp- 

 226, Ivison, Blakenian and Company, New York, 1887.) 

 The preface states that Dr. Gray chose for his first and last 

 school book the same name, with an interval of over fifty years be- 

 tween them. This last one leaves little to be desired, unless the 

 illustrations in sections xvi and xviihad been made entirely anew, 

 while the simplicity and clearness of the style and the comprehen- 

 siveness of the plan and glossary will make it the most popular 

 of school books. The first fifteen ** sections " look and sound very 

 familiar, but In sections xvi,, on Vegetable Life and Work, and 

 section xvii, Flowerless Plants, will be seen the greatest number 

 of changes, so that a pupil having carefully mastered this little 

 book will come to the high schools and colleges amply prepared 

 to do some advanced work in botany. The fact that the preface 

 is dated March, 1887, explains why the mistake on page 168, 

 tenth line, should have escaped Dr. Gray, It is hoped that the 

 publishers will remedy this in the next edition by substituting the 

 Fresh-Water Alg^ of the United States, by Francis Wolle, for a 

 book now^ entirely out of print and much behind the present state 

 of knowledge of the subject. 



Erigeron Tweedy i, lu sp.—\N, M. Canby. (Bot. Gaz., xiii., p. i?) 

 An interesting new species from Montana, collected by Mr. 

 Frank Tweedy. 



Forestry and Arboriculture in Massachusetts. — John Robinson. 

 (Annual Report Mass. Board of Agrlc, xxxv., 1887 ; pampli- 

 let, pp. 24; reprinted.) 



Garden and Forest. — A Journal of Horticulture, Landscape Art 



