238 INDEX TO AMERICAN BOTANICAL LITERATURE 
Clements, F. E., & Hall, H. M. Experimental taxonomy. Carnegie 
Inst. Washington Year Book 19: 345, 346. 3 F 1921. 
Observations of transplanted species. 
Clements, F. E., & Hall, H. M. Taxonomic monographs.. Carnegie 
Inst. Washington Year Book 19: 346, 347. 3 F 1921 
Reports very briefly studies on Artemisia, Chrysothamnus, Haplopappus and 
Atriplex. 
Clements, F. E., & Long, F. Experimental pollination. Carnegie 
Inst. Washington Year Book 19: 349. 3 F 1921 
Clements, F. E., & Long, F. Photosynthetic efficiency. Carnegie Inst. 
Washington Year Book 19: 344, 345. 3 F 1921. 
Clements, F. E., & Weaver, J. E. Transplant quadrats and areas. 
Carnegie Inst. Washington Year Book 19: 355-357. 3 F 1921. 
Clute, W. N. Botanizing in the Painted Desert [Arizona]. Am. Bot. 
27: 1-8. F 1921. [Illust.] 
Clute, W. N. Plant partnerships. Gard. Chron. Am. 25: 502, 503. 
Mr 1921. : 
Coker, W.C. Notes on the Thelephoraceae of North Carolina. Jour. 
Elisha Mitchell Sci. Soc. 36: 146-196. pl. 14-35. F 1921. 
Includes 1 new species in Aleurodiscus. 
Collins, J. F. Three plants new to Rhode Island. Rhodora 23: 27. 
8 Mr rg2t. 
Cooper, W. S. Ecology of the strand vegetation of the Pacific Coast 
of North America. Carnegie Inst. Washington Year Book 19: 
79, 00; 34°F roat: 
Cunningham, B. A pure culture method for diatoms. Jour. Elisha 
Mitchell Sci. Soc. 36: 123-126. pl. 9. F 1921. 
Cunningham, B. The occurrence of unlike ends of the cells of a single 
filament of Spirogyra. Jour. Elisha Mitchell Sci. Soc. 36: 127, 128. 
2, 10. ¥ t9at. 
Dahlgren, K. V. Zur Embryologie der Kompositen mit besonderer 
Beriicksichtigung der Endospermbildung. spsq Bot. ¥3; 461- 
516. f. I-56. 1920 
Studied many Old World and American species. 
, B. M. Salt requirements of seed plants. Carnegie Inst. 
Washes Year Book 19: 66-68. 3 F 1921. 
Duggar, B. M. The nutritive value of the food reserve in cotyledons. 
Ann. Missouri Bot. Gard. 7: 291-298. pl. 7 +f. 1. N 1920. 
Duggar, B. M. The use of ‘“‘insoluble’’ salts in balanced solutions for 
_ teed plants. Ann. Missouri Bot. Gard. 7: 307-327. f. 1-4. N 1920. 
