INDEX TO AMERICAN BOTANICAL LITERATURE 227 
Sinnott, E. W. The relation between body size and organ 
size in plants. Am. Nat. 55: 385-403. f. 1, 2. O 1921. 
Skinner, J. J.. & Reid, F.R. Nutrient requirements of clover 
and wheat in solution cultures. Soil. Sci. 12: 287-296. pl. 
£.. 42 4981, 
Small, J. K. Along the Juniata River ie Jour. 
New York Bot. Gard. 22: 168-171. 
Small, J. K. Another Sonchus for America. Torreya 21: 
100, 101. D Igat. 
Records the finding of the European Sonchus uliginosus in Pennsylvania. 
Small, J. K. Cercis chinensis. Chinese redbud. Addisonia 
6: 33, 34. pl. 209. 24 O 1921. 
Small, J. K. Monarda didyma. Oswego-tea. Addisonia 6: 
47, 48. pl. 216 24 O 1921. 
Smiley, F. J. A report upon the boreal flora of the Sierra 
Nevada of California. Univ. California Publ. Bot. 9: 1- 
423. pl. 1-7. -S 1921. 
Includes 21 new names or combinations. 
Spencer, E. R. uae of Brazil nuts. Bot. Gaz. 72: 265-292. 
pl. 8-12 + f. 1-3 1921. 
Includes new species in Pellioniella (1), Cephalosporium (1), Phomopstis 
7); 
Spink, H. M. The geographical distribution of commercial 
timber in the Pacific States of North America and its 
significance to the lumber industry. Scottish Geog. Mag. 
37: 257-266. 15 O 1921.  [Illust.] 
Sprague, T. A. The generic name Schizonotus. Jour. Bot. 59: 
249-251. S 1921. 
Sprague, T. A. Plant dermatitis. Jour. Bot. 59: 308-310. 
Steil, W. N. Vegetative reproduction and aposporous growths 
from the young sporophyte of Polypodium irioides. Bull. 
Torrey Club 48: 203-205. 265 1921. 
Steil, W. N. The development of prothallia and antheridia 
from the sex organs of Polypodium irioides. Bull. Torrey 
Club 48: 271-277. pl. 4+ f.1-4. 31D 1921. 
