viii 



SCIENCE.- ADVERTISEMENTS. 



IXUalher prises in IRatural IbistoriP 



DY the provisions of tlie will of the late Dr. William Johnson Walker two prizes are annually oSered by the 

 " Boston Society of Natural History for the best memoirs written in the English language on subjects proposed 

 by a committee appointed by the Council. 



For the best memoir presented a prize of stiO may be awarded ; if, however, the memoir be one of marked merit, 

 the amount may be increased to $100, at the discretion of the Committee. 

 For the ne.xt best memoir a prize not exceeding $.50 may be awarded. 

 Prizes will not be awarded unless the memoirs presented are of adequate merit. 

 The competition for these prizes is not restricted, but is open to all. 

 Attention is especially C iUed to the following points : 



1. In all cases the memoirs are to be based on a considerable body of original and unpublished work, accom- 

 panied by a general review of the literature of the subject. 



2. Anything in the memoir which shall furnish proof of the identity of the author shall be considered as de- 

 barring the essay from competition. 



3. Preference will be given to memoirs showing intrinsic evidence of being based upon researches made directly 

 in competition for the prizes. 



4. Each memoir must be accompanied by a sealed envelope enclosing the author's name and superscribed with 

 a motto corresponding to one borne by the manuscript, and must be in the hands of the Secretary on or before April 

 1 of the year for which the prize is oflered. 



5. The Society assumes no responsibility for publication of manuscripts submitted. 



SUBJECTS KOR X905> 



1. The life history of any parasitic fungus. 2. Contribution to our knowledge of the physiology of plants. 3. 

 Contribution to the development of some group of fossil organisms. 4. Study of hybrids in animals or plants. 

 r->. Critical study of geographical distribution of species. 6. A laboratory research in experimental geology. 7. A 

 field study of tlie mechanism of baselt^velling (peneplanation). 8. A research in mineral physics. 9. A contribu- 

 tion to geological correlation in the United States. 



SITBJCCXS FOR 1906. 



1. An experimental field study in ecology. 2. A contribution to a knowledge of the nature of competition in 

 plants. 3. A physiological life history of a single species of plant. 4. Phylogeny of a group of fossil organisms, 

 5. A study in stratigraphy. C. A research in mineral physics. 7. A study of entectics in rock magmas. 8. A study 

 in river capture. 



Boston Society of Natural History, Q LOVER M. ALLEN, Secretary. 



Boston, Mass., U. 8. A. 



yf new garden book 

 by the author of 



4( 



A Woman's Hardy Garden" 



Mrs. niy's Another Hardy Garden Book 



Published this week. Illustrated, Cloth, ^1.75 net {postage 13c). 



"A/TRS. ELY'S new book tells simply of lilies and iris, their varieties, their periods of 



-^-^ the raising of vegetables and the cul- blooming and their culture, giving some at- 



tivation of fruits for the home garden. It tention also to water lilies and other aquat- 



gives instructions for transplanting, not only ics. The chapters on Spring and Autumn 



trees, but the shrubs, flowers, and vines from work in the flower garden afford full and 



woods and meadowlands for an attractive precise directions for all that is to be done 



" wild garden." There is a long chapter on at those seasons. 



OF THE EARLIER BOOK 



Mrs. Ely's A Woman's Hardy Garden 



Now in its Sixth Edition, Cloth, ^1.75 net {postage 13c.) 

 Mrs. ALICE MORSE EARLE wrote in an extended review in the Dial : 



" Let us sigh with gratitude and read the volume with delight. For here it all is, — 

 what we should plant, and when we should plant it; how to care for it after it is 

 planted and growing ; what to do if it does not grow and blossom ; what will blos- 

 som, and when it will blossom, and what the blossom will be . . . It is a good 

 book, a wholesome book." 



THE MACMILLAN COMPANY, Publishers 64-66 Fifth Avenue, New York 



