INDEX TO AMERICAN BOTANICAL LITERATURE 387 
Stewart, E. G. Mucilage or slime formation in the cacti. Bull. 
Torrey Club 46: 157-166. pl. 8. 23 My 1919. 
Swingle, W. T. Merrillia, a new rutaceous genus of the tribe Citreae 
from the Malay Peninsula. Philip. Jour. Sci. 13: (Bot.) 335-343. 
PS 6 0.°°N TO1B: 
Tanner, F. W. Bacteriology and mycology of foods. i-vi-+1-592. 
pl. 1-10 +f. 1-85. New York. 1919. 
Van Fleet, W. New pillar rose. Jour. Heredity 10: 136-138. f. 78, 
Ig. 25 Ap 1919. 
Rosa soulieana X R, setigera. 
Van Pelt, W. Onion diseases found in Ohio. Ohio Agr. Exp. Sta. 
Month. Bull. 4: 70-76. f. 1-6. Mr 1919. 
Wakeman, N. A. Pigments of flowering plants. Trans. Wisconsin 
Acad. Sci. 19: 767-906. 1918. 
Waterman, W. G. Ecology of the pine forest relic at Interlochen, 
_ Michigan. Michigan Acad. Sci. Ann. Rep. 20: 241-244. f. 26. 
22 N 1918. 
Watkins, S. L. The western Azalea. Am. Bot. 25: 51, 52. My 
ot baton 
Weatherby, C. A. Further notes on Impatiens ete Rhodora 21: 
98-100. f. z-6. My 1g19. 
Weatherby, C. A. An omission in the preliminary list of New England 
Ranunculaceae. Rhodora 21: 104. 21 My 1919. 
Weatherby, C. A. Long Pond. Rhodora 21: 73-76. 9 My 1919. 
Weaver, J. E. The quadrat method in teaching ecology. Plant 
World 21: 267-283. f. 1-7. N 1918. 
Westgate, J. M. Report of the Hawaii Agricultural Experiment 
Station, 1918. 1-55. pl. 1-11. Washington. 10 Ap 1919. 
Wheeler, L. A. Additions to West River Valley flora. Vermont Bot. 
& Bird Club Bull. 4 & 5:8. Ap 1919. 
Whetzel, H. H. Cooperation among plant pathologists. Cornell 
Countryman 16: [1-3] F 1919. 
Whetzel, H. H. George Francis Atkinson. Bot. Gaz. 67: 366-368. 
18 Ap 1919. [Portrait.] 
Williams, E. F. George Golding Kennedy. Rhodora 21: 25-35. 
25 Mr 1919. [Portrait.] 
