INDEX TO AMERICAN BOTANICAL LITERATURE 217 
Salmon, S. C. A preliminary note on soil moisture and temperature 
factors in the winter-killing of grain crops. Science II. 47: 173, 
F 
Schaffner, J. H. Additions to the catalog of Ohio vascular plants for 
1917. Ohio Jour: Sci. 18: 99, 100. 31 Ja 1918. 
Seaver, F. J. Photographs and descriptions of cup-fungi—VII. The 
genus, Underwoodia. Mycologia 10: 1-3. pl. 1. 14 F 1918. 
Shufeldt, R. W. Studies of leaf and tree (Part 1). Am. Forest. 24: 
29-35. f. 1-15. Ja1918. Part II. Am. Forest. 24: 95-102. f. 18~ 
3r. F. 1918; Part III. Am. Forest. 24; 151-159. f. 35-50. Mr. 
1918 
Small, I. K. Collecting prickly-pears at Apalachicola. Jour. N. Y. 
Bot. Gard. 19: 1-6. pl. 208. Ja 1918 
Spurrell, J. A. The disappearance of native plants in Iowa. Proc. 
Iowa Forest. & Conserv. Assoc. 1914-1915: 100-104. I916. 
Standley, P. C. Rusts and smuts collected in New Mexico in 1916. 
Mycologia 10: 34-42. 14 F 1918. 
Stevenson, J. A. Citrus scab in Porto Rico. Porto Rico Dept. Agr. 
& Lab. Exp. Sta. Bull. 17: 1-16. 1917. 
Stevenson, J. J. Interrelations of the fossil fuels. III. Proc. Am. 
Philos. Soc. 57: 1-48. 30 Ja 1918. 
St. John, H. Additional wool waste plants. Rhodora 20: 20. 25 Ja 
1918. 
St. John, H. Lycopodium Selago var. Miyoshianum in North America. 
Am. Fern Jour. 7: 121, 122. 23 F 1918. 
Terao, H. Maternal inheritance in the soy bean. Am. Nat. 52: 51~ 
Thomas, A.O. Ona supposed fruit or nut from the tertiary of Alaska. 
Proc. Iowa Acad. Sci. 24: 113-118. pl. 5. 1917. 
Thomas, W. A. A Picea from the glacial drift. Proc. Iowa 
Sci. 24: 455,456. 1917. 
Thompson, W. P. Independent evolution of vessels in Gnetales and 
Angiosperms. Bot. Gaz. 65: 83-90. f. I-11. 17 Ja 1918. 
Thone, F. E. A. Pioneer plants on a new levee. III. Proc. lowa 
Acad. Sci. 24: 457, 458. 1917. 
Waksman, S. A. Soil fungi and their activities. Soil Sci. 2: 103-156. 
pl, 1-5. Au 1916. 
Wauters, W. M. (Mrs.). A plea for the laurel: mountain laurel as our 
national flower [1-3]. Published by Hotel McAlpin, New York. 
Ja 1918. 
Weir, J R. New hosts for Razoumofskya laricis. Phytopathology 8: 
62, 63. 25 F 1918. 
Sead. 
