Journal of Agricultural Research 



Page 

 Fig. 3. Experiment 28. Ciirve showing the quantity (in cubic centimeters) of 

 A75 nitrogen in 100 c. c. of digestion fluid, equivalent to approxi- 

 mately 5 gm. of meat or 30 gm. of skim milk 697 



4. Experiment 32. Curve showing the quantity (in milligrams) of amino 



nitrogen in 10 c. c. of digestion fluid 702 



5. Cxirve showing the rate of growth of cats on an immature- veal diet. . . . 706 



6. Curve showing the rate of growth of newly bom cats 707 



Relation between the Properties of Hardness and Toughness of 

 Road- Building Rock 



Fig. I. Curve showing the results of tests of about 3,000 samples of road- 

 building rock 905 



Apparatus for Measuring the Wear of Concrete Roads 



Fig. I. Details of instrument for measuring the wear of roads 953 



Morphology and Biology of the Green Apple Aphis 



Fig. I . Map showing the localities in the United States from which the Bureau 

 of Entomology has actual records of the green apple aphis (Aphis 

 pomi) 958 



2. Diagram showing the overlapping generations of the green apple aphis. . 982 



3. Diagram showing curves for percentage of experiments on the green 



apple aphis in which the sexes appeared 987 



4. Genealogical diagram showing the forms and generations developing 



from one stem mother of the green apple aphis 990 



Relation of Stomatal Movement to Infection by Cercospora Beti- 



COLA 



Fig. I. Stomatal pore widths on heart, mature, and old leaves and cotyledons 

 of the sugar beet in the field, together with temperatures and relative 

 humidities taken among the plants 1018 



2. Stomatal pore widths on mature leaves kept under different relative 



humidities in a humidity box and free in the greenhouse 1024 



3. Stomatal pore widths on mature leaves kept under different relative 



humidities in a humidity box and free in the greenhouse 1025 



4. Stomatal pore widths on mature leaves kept under different relative 



humidities in a humidity box and free in the greenhouse 1026 



5. Stomatal pore widths on mature leaves kept under different relative 



humidities in a humidity box and free in the greenhouse 1027 



6. Cercospora beticola: Conidia germinating on a sugar-beet leaf, but germ 



tubes not entering or being greatly attracted by closed stomata 1035 



A Method of Correcting for Soil Heterogeneity in Variety Tests 



Fig. I. Diagram illustrating the method of obtaining the "calculated" yield. . 1042 



2. Diagram showing the observed and corrected yield (in grams) of grain 



on each of Montgomery's wheat plots in 1908-9 1044 



3. Diagram showing the observed, corrected, and calculated yield (in 



grams) of Montgomery's wheat plots in groups of four, taken from 

 figure 2 1045 



4. Diagram showing the yield of oats (in bushels per acre) on the 191 5 



variety-test field at Highmoor Farm (Monmouth, Me.) 1046 



