Oct. 4,1915-Mar. 27,1916 Contents V 
Page 
Petrography of Some North Carolina Soils and Its Relation to 
Their Fertilizer Requirements. J. K. Plummer. 569 
Hourly Transpiration Rate on Clear Days as Determined by 
Cyclic Environmental Factors. Lyman J. Briggs and H. L. 
Shantz.... 583 
Effect of Natural Low Temperature on Certain Fungi and Bac¬ 
teria. H. E. Bartram. 651 
Effect of Cold-Storage Temperatures upon the Mediterranean 
Fruit Fly. E. A. Back and C. E. Pemberton. 657 
Biochemical Comparisons between Mature Beef and Immature 
Veal. William N. Berg. 667 
Factors Involved in the Growth and the Pycnidium Formation of 
Plenodomus fuscomaculans. George Herbert Coons. 713 
Effect of Elemental Sulphur and of Calcium Sulphate on Certain 
of the Higher and Lower Forms of Plant Life. Walter Pitz. . 771 
A Serious Disease in Forest Nurseries Caused by Peridermium 
filamentosum. James R. Weir and Ernest E. Hubert. 781 
Sweet-Potato Scurf. L. L. Harter... 787 
Banana as a Host Fruit of the Mediferranean Fruit Fly. E. A. 
Back and C. E. Pemberton. 793 
Effect of Controllable Variables upon the Penetration Test for 
Asphalts and Asphalt Cements. Provost Hubbard and F. P. 
Pritchard.. 805 
Effects of Refrigeration upon the Larvae of Trichinella spiralis. 
B, H. Ransom. 819 
Relation Between Certain Bacterial Activities in Soils and Their 
Crop-Producing Power. Percy Edgar Brown. 855 
Agglutination Test as a Means of Studying the Presence of Bac¬ 
terium abortus in Milk. L. H. CoolEdge. 871 
Boron: Its Absorption and Distribution in Plants and Its Effect on 
Growth. F. C. Cook. 877 
Further Studies on Peanut Leafspot. Frederick A. Wolf. 891 
Relation Between the Properties of Hardness and Toughness of 
Road-Building Rock. Provost Hubbard and F. H. Jackson, 
Jr. 903 
Nitrogen Content of the Humus of Arid Soils. Frederick J. Al- 
way and Earl S. Bishop. 909 
Life-History Studies of the Colorado Potato Beetle. Pauline M. 
Johnson and Anita M. Ballinger. 917 
