INDEX TO AMERICAN BOTANICAL LITERATURE 
1913-1916 
The aim of this Index is to include all current botanical literature written by 
Americans, published in America, or base upon American material ; the word Amer- 
ica being used in the broadest s 
eviews, and papers that ‘adie exclusively to forestry, agriculture, Rar gi 
manufactured products of vegetable origin, or laboratory methods are not i d 
no attempt is made to index the literature of bacteriology. An Scmeals cau is 
made in favor of some Bee appearing in an American periodical which is devoted 
wholly to botany. Reprints’ are not men pa unless they differ from’ the original in 
some important particular. Ih of the ex will call the attention of the editor 
to errors or omissions, their kindness will be appreciated. 
This Index is reprinted monthly on cards, and furnished in this form to subscribers 
at the rate of one cent for each card, Selections of cards are not permitted ; each 
subscriber must take all cards published during the term of his subscription, Corre- 
spondence relating to the card issue should be addressed to the Treasurer of the Torrey 
Botanical Club, 
Allard, H. A. Some properties of the virus of the mosaic disease of 
tobacco. Jour. Agr. Research 6: 649-674. pl. g1. 24 Jl 1916. 
Ayres, A. H. The temperature coefficient of the duration of life of 
Ceramium tenuissimum. Bot. Gaz. 62: 65-69. 15 Jl 1916. 
Bailey, I. W. The structure of the bordered pits of conifers and its 
bearing upon the tension hypothesis of the ascent of sap in plants. 
Bot. Gaz. 62: 133-142. pl. I +f. 1,2. 15 Au 1916. 
Bartlett, H. H. The hetantcat work of Edward Lee Greene. Torreya 
16: 151-175. Portrait. Jl 1916. 
Bassler, H. A cycadophyte from the North American coal measures. 
Am. Jour. Sci. IV. 42: 21-26. Jl 1916. 
Berry, E. W. A Zamia from the lower Eocene. Torreya 16: 177-179. 
f. r., Au 1916. 
Zamia mississippiensis sp. nov. 
Blake, S. F. A revision of the genus Polygaia in Mexico, Central 
apenas and the West Indies. Contr. Gray Herb. II. 47: I-122. 
2. 
aE descriptions of thirty-six new species. 
539 
