xiv Journal of A grictdtural Research voi. xr v 
Influence of Humidity upon the Strength and the Elasticity of Wool page 
Fiber 
Fig. i. Graphs showing the effect of humidity upon the tensile strength of the 
wool fiber. 290 
2. Graphs showing the effect of humidity upon the elasticity of the wool 
fiber. 292 
Availability of Potash in Some Common Soil-Forming Minerals— 
Effect of Lime upon Potash Absorption by Different Crops 
Fig. 1. Rate of growth of oats under similar conditions fertilized with double 
applications of potash minerals and calcium carbonate. 305 
2. Rate of growth of soybeans under similar conditions fertilized with 
double applications of potash minerals and calcium carbonate. 307 
3. Rate of growth of rye under similar conditions fertilized with double 
applications of potash minerals and calcium carbonate. 309 
4. Rate of growth of cowpeas under similar conditions fertilized with 
double applications of potash minerals and calcium carbonate. 312 
Influence of Reaction on Nitrogen-Assimilating Bacteria 
Fig. 1. Graphs showing the buffer effect of the various constituents of man¬ 
nitol medium. 322 
Variation and Correlation in Wheat, with Special Reference to 
Weight of Seed Planted 
Fig. i. Graphs showing the frequency distribution of wheat plants for average 
height. 1914-1917. 368 
2. Graphs showing the frequency distribution of wheat plants for yield of 
kernels. 368 
3. Graphs showing the frequency distribution of wheat plants for number 
of culms. 369 
4. Graphs showing the frequency distribution of wheat plants for average 
weight of kernels. 370 
3. Graph showing regression for weight of seed and yield of kernels per 
wheat plant in 1914. 377 
d. Graph showing regression for weight of seed and yield of kernels per 
wheat plant in 1915. 378 
7. Graph showing regression for weight of seed and yield of kernels per 
wheat plant in 1916. 380 
8. Graph showing regression for weight of seed and yield of kernels per 
wheat plant in 1917. 383 
PiftoN Blister-Rust 
Fig. 1. Outline sketch map showing the distribution of Pinus edulis and of P. 
monophylla in the United States. 416 
Comparative Toxicity of Cottonseed Products 
Fig. 1. Graphs showing the toxicity of cottonseed meal and kernels to rats— 429 
2. Graphs showing the toxicity of various diets to rats. 430 
3. Graphs showing the toxicity of cottonseed flour to rats. 434 
4. Graphs showing the effect of cottonseed products on the growth of pigs. 445 
5. Graphs showing the effect of various diets on the growth of pigs. 446 
