INDEX TO AMERICAN BOTANICAL LITERATURE 
1911-1921 
The aim of this Index is to include all current botanical literature written by 
Americans, published in aie or based upon American material ; the word Amer- 
ica being used in the broadest 
Reviews, and pa pee ris Tals exclusively to forestry, agriculture, horticulture, 
saladercd products of vegetable origin, or laboratory methods are not included, and 
no attempt is made to index the literature of bacteriology. An occasional exception is 
ade in favor of some paper appearing in an American periodical which is devoted 
wholly to botany. ee ae are not mentioned unless they 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 appreciated. 
This Index is reprinted monthly on cards, and furnihed in this form to subscribers 
at the rate of three cents for each card. Selections of cards are not permitted; each 
subscriber must take all cards “pabliatet iad the term of his subscription, Corre. 
spondence relating to the card issue should be addressed to the Treasurer of the Torrey 
Botanical Club. 
[Abbott, W. L., & Leonard, E. C.] Biological exploration in Haiti 
[1920]. Smithson. Misc. Coll. 72°: 43-47. f. 56-59. 
Adams, J. F. Observations on wheat scab in Pennsylvania and its 
pathological histology. Phytopathology 11: 115-124. pl. 2, 3 + f. I. 
r 1921. 
Almquist, S. Rosae musei regni suecici in methodum naturalem re- 
dactae. Arkiv Bot. 16°: 1-51. f. 1-6 + tab. 1-8. 16 Je 1920. 
Appleman, C. O. Evaluation of climatic temperature efficiency for the 
ripening processes in sweet corn. Jour. Agr. Research 20: 795- 
805. f. 7 1 Mr 1g2t. 
Babcock, E. B. Bud selection and the frequency of mutations. Bull. 
Dept. Agr. California 10: 137-140. Ap 1921. 
Baez, J. R. Somera relacion de la vegetacion suburbana de Parana 
[Argentina]. Anal. Assoc. Estud. Mus. Popul. Parana 1920: 35- 
41. f. I-g. . 1920. 
Baker, F. C. The life of the Pleistocene or Glacial Period. Univ. 
Illinois Bull. 17, n. 41: 1-476. pl. 1-57 +f. 1-3. 7 Je 1920. 
Baker, F.S. Two races of aspen. Jour. For. 19: 412, 413. Ap 1921. 
Populus tremuloides in Uta 
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