INDEX TO AMERICAN BOTANICAL LITERATURE 
1917-1920 
e aim of this Index is to include all current botanical literature written by 
Americans, published in America, or based upon American material ; the word Amer. 
ica being used in the broadest se 
Reviews, and papers. that eo exclusively to forestry, agriculture, horticulture, 
manufactured products of vegetable origin, or laboratory methods are not included, and 
no attempt is made to index the literature of ae An occasional exception is 
made in favor of some paper appearing in an American periodical which is devoted 
wholly to botany. oe are not mentioned tea hey 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 furnished in this form to sub- 
‘scibers at the rate of 3 centsforeach card. Selection of cardsis not permitted; 
each subsciber 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. 
Johns, C. O., & Gersdorff, C.E. F. The globulin of the cohune nut, 
Aitalea Cohune. Jour. Biol. Chem. 45: 57-67. pl. r. D 1920. 
Knudson, L. The secretion of invertase by plant roots. Am. Jour. 
HOt. 7. 371-379)... 7. 1920. 
Kranzlin, F. Beitrage zur Kenntnis der Gattung Telipogon H. B. K. 
Ann. Naturh. Hofmus. Wien 33: 9-38. 1919. 
Includes 9 new species from tropical America. 
Lee, H. A., & Serrano, F. B. Banana wilt in the Philippines. Phy- 
topathology 10: 504, 505. 1920. 
Lloyd, F. E. Colloidal phenomena in the protoplasm of pollen tubes. 
Carnegie Inst. Washington Year Book 16: 63, 64. 1917. 
Lobo, B. Ilha da Trindade. Arch. Mus. Nac. Rio Janeiro. 22: 
107-158. 1919. [Illust.] 
Includes a brief discussion of the flora. 
Long, E. R. Dessication and respiration in succulent plants. Car- 
negie Inst. Washington Year Book 16: 80-82. 191 
Lowe,C.W. The flora of Warrens Landing, Lake pis tee Manitoba. 
Can. Field Nat. 33: 26-30. f. z, 2. F 1920. 
Lutman, B. F. Tip burn of the potato and other plants. Vermont 
Agr. Exp. Sta. Bull. 214: 4-28. pl. z, 2+ f. 1-9. Je 1919. 
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