INDEX TO AMERICAN BOTANICAL LITERATURE 
1916-1921 
The aim of this Index is to include all current botanical literature written by 
Americans, published in aaah or based upon American material ; the word Amer- 
ica being used in the broadest s : 
Reviews, and papers that he exclusively to forestry, agriculture, horticulture, 
manufitered products of vegetable origin, or laboratory methods are not included, an 
o attempt is made to index the literature af ee An occasional exception is 
ade in favor of some paper appearing in an Am odical which is devoted 
wholly to botany. Reprints are not secathoniad a ey differ from the original in 
some important particular. If users of the Index will call the attention of the editor 
to errors or omissions, their kindness will be aetiale 
is Index is reprinted monthly on cards, and furnished in this form to sub- 
scribers at the rate of three cents for each card. Selection of cards is not permitted: 
each subscriber must take all cards published during the term of his subscription. 
Correspondence relating to the card issue should be addressed to the Treasurer of 
the Torrey Botanical Club. 
Adams, J. F. Notes on plant diseases in Pennsylvania for 1916. 
Ann. Rep. Pennsylvania State Coll. 1916-17: 329-336. f. 2-12. 
I9I9Q. 
André, H. Uber die Ursachen des periodischen Dickenwachstums des 
Stammes. Zeitschr. Bot. 12: 177-218. pl. 3,4 +f. 1. 1920. 
Among plants studied are species of Nicotiana and Lantana. 
Arthur, J. C. New combinations for phanerogamic names. Torreya 
Ps Ba GR or Raage se eek 
9 combinations in various genera. 
Arthur, J.C. Origin of potato rust. Science II. 53: 228, 229. 11 Mr 
1921. 
Sosiivec’ G. Un nouveau Mitracarpus de l'Uruguay. . Bull. Soc. 
Bot. Genéve II. 12: 14, 15. 31 Ja 1921. 
Bequaert, J. On the dispersal by flies of the spores of certain mosses 
of the family Splachnaceae. Bryologist 24: 1-4. 22 Mr 1921. 
Bergman, H. F. The effect of cloudiness on the oxygen content of 
water and its significance in cranberry culture. Am. Jour. Bot. 8: 
50-58. f. 1-3. 9 Mr 1921. 
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