Oct. 4, i9is-Mar. 27, 1916 Coutents 



Petrography of Some North Carohna 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 f uscomaculans. 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 Mediterranean Fruit Fly. E. A. 



Back and C. E. Pemberton 793 



Effect of Controllable Variables upon the Penetration Test for 



Asphalts and Asphalt Cements. Pre;vost Hubbard and F. P. 



Pritchard 805 



Effects of Refrigeration upon the Larvae of Tricn...- . ' ^l:s. 



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. Prevost 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 



