418 INDEX TO AMERICAN BOTANICAL LITERATURE 
Boynton, K. R. Eupatorium coelestinum. Addisonia 4: 39, 40. 
pl. 140. 30 Je 1919. 
Britton, N. L. & Rose, J. N. The Cactaceae. Descriptions and illus- 
trations of plants of the Cactus family. i-vii + 1-236. pl. 1-36 + 
f. t-3or. Washingtan. 1919. 
Carnegie Publ. No. 248, Vol. I; includes the new genus Tacinga and new species 
in Opuntia (30), Pereskia (4), Pterocactus (3), Nopalea (1), and Tacinga (1). 
Burt, E. A. Merulius in North America, supplementary notes. Ann. 
Missouri Bot. Gard. 6: 143-145. Ap rg1g. 
Clark, H. W. Dwarf shore floras. Trans. Illinois Acad. Sci. 10: 145- 
159, pl. 1-5. 1917. 
Clayton, E.E. Hydrogen cyanide fumigation. Bot. Gaz. 67: 483-500. 
fe 2, 22:22% Je toto. 
Clute, W. W. Defining double flowers. Gard. Chron. Am. 23: 189. 
Je 1919. 
Cockerell, T. D. A. Sir Joseph Hooker. Science II. 49: 525-530. 
6 Je 1919. 
Collins, G. N. A fossil ear of maize. Jour. Heredity 10: 170-172. 
f.7. 26 My 1919. 
Coville, F. V. The threatened extinction of the box huckleberry, 
Gaylussacia brachycera. Science II. 50: 30-34. 11 Jl 19109. 
Dalbey, N. E. Phyllachora as the cause of a disease of corn, and a 
general consideration of the genus Phyllachora. Trans. Illinois 
Acad. Sci. 10: 230-248. f. 3-9. 1917 
Duggar, B. M., & Davis, A. W. Seed disinfection for pure culture 
work: the use of hypochlorites. Ann. Missouri Bot. Gard. 6: 
159-170. Ap I9gI9. 
Ensign, M. R. Gas injury to wheat. Phytopathology 9: 266. 24 Je , 
I9I9Q. 
Evans, A. W. A new Riccia from Peru. Torreya 19: 85-88. f. I- 
9 Jl 1919. 
Riccia bistriata sp. nov. 
Falk, K. G., McGuire, G., & Blount, E. Studies on enzyme action— 
XVII. The oxidase, peroxidase, catalase, and amylase of fresh 
and dehydrated vegetables. Jour. Biol. Chem. 38: 229-244- 
Je 1919. 
Farwell, O. A. Tsuga americana (Mill.) Farwell, a final word. Rho- 
dora 21: 108, 109. Je 1919. 
