56 MINNESOTA BOTANICAL STUDIES. 



marked response to weak solutions of acids and alkalies as to strong- 

 er ones. 



6. Plants lose more water by transpiration for unit area when 

 grown in soils of coarse texture than when grown in soils of fine 

 texture. It is probably due to the fact that the physiological water 

 of the coarse soils is greater than that of the finer soils. Soil tex- 

 ture seems to have nothing to do with the amount of green weight 

 produced. 



There appears to be a slight tendency for transpiration to be 

 depressed in the better soils. Also a correlation can be seen be- 

 tween transpiration and the green weight of the tops. 



Bibliography. 



1. Areschoug, F. W. C. 



Der Einflusz des Klimas auf die Organisation der Pflanzen, in- 

 besondere auf die anatomische Struktur der Blattorgane. (En- 

 gler Botan. Jahrb. Bd. II, 1882, p. 511). 

 Ref. Burgerstein, 46. 



2. Albert, M. 



Recherches sur la turgescence et la transpiration des plantes 

 grasses. Ann. Sc. Nat. Bot. ser. 7, tom. XVI. 1892, p. i. 



3. Bonnier. G., and Mangin, L. 



Recherches physiologiques sur les champignons. Compt. rend, 

 de I'acad. des sc. Paris tom. XCVI, 1883. p. 1075. 

 , . Recherches sur la respiration et la transpi- 

 ration des champignons. Ann. Sc. Nat. Bot. 6 ser. tom. XVII, 

 1884, p. 210. 



, . Influence des h.autes altitudes sur les fonc- 



tions des Vegetaux. Compt. rend, des I'acad. des sc. Paris tom. 

 CXI, 1890, II, p. Z77- 



4. Burgerstein, A. 



Die Transpiration der Pflanzen. Jena, 1904. 



5. Cameron, F. K. 



Soil solutions, etc. U. S. Dept. of Agric, Div. of Soils. Bull. 



17, 1901. 

 (.. Cannon, W. .A.. 



On the Water-Containing Systems of some Desert Plants. Bot. 



Gaz. 39:397-408. 

 7. Clements, F. E. 



Research Methods in Ecology, 1905. 



, . Causes of Dwarfing in Alpine Plants. Sci- 



