20 MISCELLANEOUS PUBLICATION NO. 725, U.S. DEPARTMENT OF AGRICULTURE 
Clapper, R. B. 282 
1954. Chestnut breeding, techniques and results. I. Breed- 
ing material and pollination techniques. II. In- 
heritance of characters, breeding for vigor, and 
mutations. Jour. Heredity 45: 106-114, 201-208, 
illus. 
Clapper; RR. B. 283 
1954. Stimulation of pine oleoresin flow by fungus inocu- 
lation. Econ. Bot. 8: 269-284, illus. 
Clapper, R. B., and Beattie, R. Kent. 2S 4: 
1944. American and blight-resistant chestnuts. Flower 
Grower 31: 488-489, 500, illus.. 
Clapper, R. B., and Gravatt, G. F. 
[1937.} Status of work with blight-resistant chestnuts. North. 
Nut Growers Assoc. Proc. (1936) 27: 58-60. 
Also, with title, Work with blight-resistant chestnuts, in 
Amer. Nurseryman 65 (9): 7-8. 1937. 
Clapper, R. B.,, and*Gravatt)) Go. 286 
1943. The american chestnut--its past, present and future. 
South. Lumberman 167 (2105): 227-229, illus. 
Clapper, R. B., and Gravatt, G. F. 287 
1946. How hardy are Oriental chestnuts and hybrids? 
North. Nut Growers' Assoc. Proc. 37: 64-66. 
Clapper, R. B., Gravatt, G. F., and Stout, Donald C. 288 
1946. Endothia canker on post oak. U. S. Bur. Plant 
Indus., Plant Dis. Rptr. 30: 381. [Processed.] 
Clapper, R. B., and Miller, John M. 289 
1949. Breeding and selecting pest-resistant trees. U. S. 
Dept. Agr. Yearbook (Trees) 1949: 465-471. 
Clarke, M. A.--See Goss, Marie C. 
285 
Cockerell, T. D. A. 291 
1926. Ellsworth Bethel. Science 63: 201-202. 
Coe, Donald M. and Wagener, Willis W. 292 
1949. Ash anthracnose appears in California. U. S. Bur. 
Plant. Indus., Soils, and Agr. Engin., Plant 
Dis. Rptr..33: 232. [Processed, | 
Cohen, Isadore, and Doak, K. D. 293 
1935. The fixing and staining of Liriodendron tulipifera 
root tips and their mycorrhizal fungus. Stain 
Technol... 10: 25-32... i1hwsp 
Colley, Reginald H. 294 
1917. Diagnosing white-pine blister-rust from its | 
mycelium. Jour. Agr. Res. 11: 281-286, illus. 
Colley, Reginald H. 295 
1917. Discovery of internal telia produced by a species of 
Cronartium. Jour. Agr. Res. 8: 329-332, illus. 
Colley, Reginald H. 296 
1917. Mycelium of the white pine blister rust. (Abstract) 
Phytopathology 7: 77. 
Colley, Reginald H. 297 
1917. Pycnial scars, an important diagnostic character 
for the white pine blister rust. (Abstract) 
Phytopathology ?: 77. 
Colley, Reginald H. 298 
1917. Technique for the study of the white pine blister rust. 
(Abstract) Wash. Acad. Sci. Jour. 7: 314. 
