[JUST PUBLISHED] 



Send 12 cents, U. S. stamps, for 



Wm» Wesley & Son^s Botanical Catalogue^ 1 901 



Being 



No. J37-J38 of 



THE 



NATURAL 



HISTORY and 



SCIENTIFIC 



BOOK 



CIRCULAR 



BOTANY 



More than 3300 works, 

 classified under 42 



headings 



J 04 pages 



CONTENTS : 



Transactions of Scientific Societies 



Periodicals 



Bibliography History 



Biographies and Portraits 



Hcrbals Early Botanical Science Linnaeus 



Handbooks 



Microscopy Morphology and Physiology 



Encyclopaedic works Classification 



• Jll 



.enclature 



Fossil Plants 



Cryptogams Phanerogams 



Natural distribution of Plants (Floras) 



Agriculture and Horticulture to the end of the 18th century 



Gardening 



Landscape Gardening 



The Flower and Ornamental Garden 



Husbandry Tropical Agriculture Commercial Plants 



Medical Botany 



Forestry 



Diseases of Plants 



William Wesley & Son^ Booksellers 



28 Essex Street, Strand, 



London, England 



Mamer pvixcQ in IFlaturat Ibistor^ 



mi 



BY the provisions of the will the late Dr. William Johnson W^alker two prizes are annually offered 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 $60 may be awarded; if, however, the memoir be one of marked men , 

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



For the next best memoir, a prize not exceeding $50 may be awarded. 



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



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



Attention is especially called to the following points: • j 



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 In all cases the memoirs are to be based on a considerable body of original and unpublished work, accompaniea 

 by a general review of the literature of the subject. 



a. Anything in the memoir which shall furnish proof of the identity of the author shall be considered as debarnng 

 the essay from competition. ,. > 



3. Preference will be given to memoirs showing Intrinsic evidence of being based upon researches made direc y 

 in competition for the prize. , . , 



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

 motto corresponding to one borne by the manuscript, and must be in the hands of the Secretary on or before April i 01 

 year for which the prize is offered. 



+ 



FOR 1903 



1, A monograph of any genus or group of Thallophytes. 

 a. Contributions to the life history of Sporozoa. 



SUBJECTS FOR 1904 



I. The reactions of organisms to solutions, considered from the standpoint of the chemical theory of dissociation. 



3. Relations of plants to electricity, 



3. A statistical study of the relative cross-fertility between the varieties of a species. 



4. The chemical and physical reactions in cell narcosis. 



'S- Causes of volcanic eruptions. . . -^ 



6. The effects of past or present physical changes of the earth's surface on the development of species {e. ^m 

 work, changes of sea level, mountain building, etc.). 



Boston Society OF Natural History "QLOVER M. ALLEN, Secretary 



Boston, Mass,, £/, 5, A, 



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