146 THE AMERICAN NATURALIST. [Vol. XXXVII. 



by G. G. Hedgcock has recently been published on The relation of 

 the water content of the soil to certain plants, principally mesophytes. 



A bulletin on dissemination, under the title " Plant travelers," by 

 Professor Weed, is published as Nature Study Leaflet No. 3 of the 

 New Hampshire College Agricultural Experiment Station. 



A paper by Matruchot and Molliard, on the Effects of frost on the 

 structure of plant cells, is contained in the Revue Generate de Bota- 

 nique for October 15th. 



A lecture on Health and disease in plants, by F. S. Earle, is 

 published in the Journal of The New York Botanical Garden for 



Studies on cell division in cambium, by Schoute, have been issued 

 from the Verhandelingen der Koninkliijke Akademie van Wetenschappen, 

 of Amsterdam, under date of October, 1902. 



A paper on the Cactacese of Costa Rica, by Dr. Weber, separately 

 printed from No. 6 of the current volume of Bulletin du Museum 

 d'histoire naturelle, contains several new species of Cereus, Phyllo- 

 cactus, Rhipsalis and Pereskia. 



Echinacea purpurea and its varieties are considered in the Revue 

 Horticole of November 1st. 



An exhaustive local treatment of Salix, with reference to the forms, 

 including hybrids, which occur about Regensburg, by Anton Mayer, 

 is published as Heft VII of the Berichte des naturwissenschaftlichcn 

 Vereines zu Regensburg, for 1898-9. 



An article on I'inus lambertiana is contained in La Feuille des 

 Jeunes Naturalistes, of November 1st. 



A paper on the Ferns of the Pacific Coasts, by Dr. Yates, is pub- 

 lished in Popular Science News for November. 



An illustrated monograph of the Ulothricaceas and Chaetophoracea± 

 of the United States, by T. K. Hazen, constitutes Vol. XI, No. 2, of 

 the Memoirs of the Torrcy Botanical Club. 



No. 5 of the current volume of the Bulletin du Jardin Imperial 

 Botanique, shows that at the beginning of the present year 35 141 

 forms of plants were cultivated in the famous St. Petersburg Gardens, 

 the herbarium of which is said to contain more than a million and a 

 half of dried plants and the library to contain 29520 books compris- 

 ing 14608 titles. 



