184 ALFRED DACHNOWSKI AND R. GORMLEY 
Various other phases of the role of retained water — features which 
must enter into a conception of growth embodying the interplay and 
correlation of organic parts, their time relation, their changes in form 
and size, and their metabolism of materials and energy — have been 
considered briefly in another paper (8). The amount of water 
retained in cells and tissues determines which way biochemical reac- 
tions shall go, and it therefore becomes possible to apply this method 
directly to reactions which involve normal activtiy , such as respiration, 
pigmentation, growth curv^atures, etc., as well as pathological condi- 
tions leading to death. 
LITERATURE CITED 
1. Borowikow, G. A. Ueber die Ursachen des Wachstums der Pflanzen. Biochem, 
Zeitsch. 50: 119, 1913. 
2. Briggs, L. J. and Shantz, H. L. The wilting coefficient for different plants and 
its indirect determination. Bur. Plant Ind., U. S. Dept. of Agr. Bull. 230, 
1912. 
3. The water requirement of plants. Ibid., Bull. 284, also 285, 1913. 
4. Caldwell, J. S. The relation of environmental conditions to the phenomenon of 
permanent wilting in plants. Physiological Researches I: 1-56, 1913. 
5. Dachnowski, A. Physiologically arid habitats and drought resistance in plants. 
Bot. Gaz., 49: 325-339, 1910. 
6. The nature of the absorption and tolerance of plants in bogs. Bot. Gaz. 
54: 503-514. 1912. 
7. — — Peat deposits of Ohio, their origin, formation and uses. Geol. Surv. 
Ohio, Bull. 16, 1912. 
8. Transpiration in relation to growth and to the successional and geo- 
graphical distribution of plants. Ohio Naturalist 14: 241-251, 1914. 
9. Livingston, B. E. and Brown, W. H. Relation of the daily march of transpiration 
to variation in the water content of foliage leaves. Bot. Gaz. 53: 309-330, 
1912. 
10. McPherson, W. The formation of carbohydrates in the vegetable kingdom. 
Science 33: 131,1911. 
