INDEX TO AMERICAN BOTANICAL LITERATURE 525 
Christensen, C. A monograph of the genus Dryopteris. Part I. 
The tropical American pinnatifid-bipinnatifid species. 55-282. f. 
I-46. Copenhagen. 1913. 
Includes descriptions of eighteen new species. 
Clevenger, J. F. The effect of the soot in smoke on vegetation. Mellon 
Inst. Ind. Research Bull. 7: 1-26. pl. 1-8. 1913. 
Clinton, G. P. Report of the botanist. Ann. Rep. Connecticut Agr. 
Exp. Sta. 36: 341-453. pl. 17-28. 1912. 
Includes I. Notes on plant diseases of Connecticut and, II. The chestnut bark 
disease, 
Clute, W. N. The beech ferns. Am. Bot. 20: 41-43. My 1914. 
[Illust.] 
Coe, H. S. Weeds. S. Dakota Agr. Exp. Sta. Bull. 150: 380-453. 
f. 1-29. Ap 1914. 
Collins, G. N. Improvements in technique of corn breeding. Ann. 
Rep. Am. Breeders’ Assoc. 8: 349-352. 1912. 
Conel, J. L. A study of the brown-rot fungus in the vicinity of Cham- 
paign and Urbana, Illinois. Phytopathology 4: 93-101. 23 Ap 1gt4. 
Cook, M. T. Diseases of shade and forest trees. New Jersey Forest 
Comm. 93~124. f. 36-43. 1912. 
Cook, M. T. Grain smuts: their causes and treatments. New Jersey 
Agr. Exp. Sta. Circ. 36: 1-3. 1914. 
Cook, M.T. The insect galls of Michigan. Mich. Geol. & Biol. Surv. 
Publ. 1: 23-33. 1910. 
Cook, M. T., & Martin, G. W. The Jonathan spot rot. Phytopath- 
ology 4: 102-105. 23 Ap 1914 
Coons, G.H. The potato diseases of Michigan. Michigan Agr. Exp. 
Sta. Special Bull. 66: 1-31. f. 1-13. Mr 1914. 
Coulter, J. M., & Land, W. J. G. The origin of monocotyledony. 
Bot. Gaz. 57: 509-519. pl. 28, 29 + f. 1,30. 19 Je 1914 
Davidson, A. Notes on southern California flora. “Bull. S. California 
Acad. Sci. 13: 43, 44. Jl 1914. 
Derr, H. B. The breeding of winter barleys. Am. Breeders’ Mag. 3: 
108-113. Je 1912. [Illust.] 
Dietz, A.K. Permanent vegetation quadrats at Douglas Lake. Ann. 
Rep. Michigan Acad. Sci. 15: 199, 200. 1913. 
Dorsey, M. J. Variation studies of the venation angles and leaf 
dimensions in Vitis. Ann. Rep. Am. Breeders’ Assoc. 7: 227-250. 
Je Ed. -1O14, 
Durrell, L. W. The Iridales of Ohio. Ohio Nat. 14: 327-331. 21 
My 1914. 
Dynes, O. W. The branching character in flax. Ann. Rep. Am. 
Breeders’ Assoc. 8: 449-452. 1912. 
