20, 6 Mendiola: Weight and Ash Content of Tobacco 655 
ACKNOWLEDGMENT 
Thanks are due to Prof. C. F. Curtis, of the botany department 
of Cornell University, for suggestions and criticisms in this work. 
LITERATURE CITED 
1. Lawes, J. B. Experimental investigation into the amount of water 
given off by plants during their growth; especially in relation to the 
fixation and source of their various constituents. Journ. Hort. Soc. 
London 5 (1850) 38-63. 
2. SCHLOESING, TH. Tabac sous cloche et a l’air libre. Ann. Sci. Nat. 
Bot. V 10 (1869) 366-369. 
3. SorAuER, P. Der Einfiuss der Luftfeuchtigkeit. Bot. Zeit. 36 (1878) 
1-18, 17-25. 
4, SoRAUER, P. Studien iiber Verdunstung. Forschungen auf dem Gebiete 
der Agrikultur Physik 3 (1880) 351-490. 
5. WoLLNy, W. Untersuchungen iiber den Einfluss der Luftfeuchtigkeit 
auf das Wachstum der Pflanzen. Inaug. Diss. Halle (1898). 
6. PFEFFER, W. The physiology of plants 1 (1900) 235. 
7. LIVINGSTON, B. E. Relation of transpiration to growth in wheat. Bot. 
Gaz. 40 (1905) 178-195. 
8. Jost, L. Lectures on plant physiology (1907) 43, 79. 
9, THATCHER, R. W. The chemical composition of wheat. Washington 
State Bull. 111 (1913). 
10. HASSELBRING, H. The effect of shading on the transpiration and 
assimilation of the tobacco plant in Cuba. Bot. Gaz. 57 (1914) 72, 
257. ; 
11. KiesseLBAcH, T. A. Transpiration as a factor in crop production. 
Bull. Nebr. Agr. Exp. Sta. Res. 6 (1916) 170. 
12. Harris, J. A., GoRTNER, R. A., and LAWRENCE, J. V. The relationship 
between the osmotic concentration of leaf sap and height of leaf 
insertion in trees. Bull. Torrey Bot. Club 44 (1917) 267-286. 
