May 3 i, 1924 Cell Sap Density and Environmental Conditions 
901 
(13) Bouyoucos, G. J. 
1919. RATE AND EXTENT OF SOLUBILITY OF SOILS UNDER DIFFERENT 
treatments and conditions. Mich. Agr. Exp. Sta. Tech. Bul. 
44, 49 p., illus. 
(14) Burd, J. S. 
1919. RATE OF ABSORPTION OF SOIL CONSTITUENTS AT SUCCESSIVE STAGES 
of plant growth. Jour. Agr. Research 18: 51-72. 
(15) Butler, B. S., and Loughlin, G. F. 
1916. A RECONNAISSANCE OF THE COTTONWOOD-AMERICAN FORK MINING 
region, utah. U. S. Geol. Surv. Bul. 620: 165-226, illus. 
(16) C AVAR A, F. 
1905. RISULTATI DI UNA SERIE DI RICERCHE CRIOSCOPICHE SUI VEGETALI. 
Contrib. Biol. Veg. R. 1st. Bot. Palermo 4: 41-80, illus. 
(17) Chandler, W. H. 
1913. THE KILLING OF PLANT TISSUES BY LOW TEMPERATURE. Mo. Agr. 
Exp. Sta. Research Bul. 8: 143-309, illus. 
(18) - 
1914. SAP STUDIES WITH HORTICULTURAL PLANTS. Mo. Agr. Exp. Sta. 
Research Bul. 14: 489-552, illus. 
(19) Clements, E. S. 
1905. THE RELATION OF LEAF STRUCTURE TO PHYSICAL FACTORS. Trans. 
Amer. Micros. Soc. 26: 19-102, illus. 
(20) Clements, F. E. 
1916. plant succession; an analysis of the development of vegeta¬ 
tion. 512 p., illus. Washington, D. C. (Carnegie Inst. Wash. 
Pub. 242). 
( 21 ) - 
1920. plant indicators: the relation of plant communities to 
process and practice. 388 p., illus. Washington, D. C. 
(Carnegie Inst. Wash. Pub. 290) 
(22) Coville, F. V. 
1920. the influence of cold in stimulating the growth of plants. 
Jour. Agr. Research 20: 151-160, illus. 
(23) Dixon, H. H. 
1909. NOTE ON THE TENSILE STRENGTH OF WATER. Sci. PrOC. Roy. 
Dublin Soc. (n.s.) 12: 60-65. 
(24) - 
1909. VITALITY AND THE TRANSMISSION OF WATER THROUGH THE STEMS 
of plants. Sci. Proc. Roy. Dublin Soc. (n. s.) 12: 21-34, illus. 
(25) -and Atkins, W. R. G. 
1910. ON OSMOTIC PRESSURE IN PLANTS; AND ON A THERMO-ELECTRIC 
METHOD OF DETERMINING FREEZING-POINTS. Sci. PrOC. Roy. 
Dublin Soc. (n. s.) 12: 275-311. 
(26) - 
1912. CHANGES IN THE OSMOTIC PRESSURE OF THE SAP OF THE DEVELOP¬ 
ING leaves of syringa vulgaris. Sci. Proc. Roy. Dublin 
Soc. (n. s.) 13: 219-222. 
(27)- 
1912. variations in the osmotic pressure of the sap of ilex aqui- 
folium. Sci. Proc. Roy. Dublin Soc. (n. s.) 13: 229-238. 
1912. variations in the osmotic pressure of the sap of the leaves 
of hedera helix. Sci. Proc. Roy. Dublin Soc. (n. s.) 13: 239- 
246. 
(28) 
