188 INDEX TO AMERICAN BOTANICAL LITERATURE 
Howe, C. G. Pectic material in root hairs. Bot. Gaz. 72: 
313-320. 15 N I92I. 
Hubert, E. E. Notes on sap stain fungi. Phytopathology 11: 
214-224. pl. 7 + f. 1-4. 6 O I92I. 
Huhnholz, P. Echinocactus Anisitsii KK. Sch. Monatschr. 
Kakteenk. 31: 150, 151. .O 1921. 
Mick, J. S. The American walnuts. Am. For. 27: 699-704. 
N 1921. [Illust.] 
Inman, O. L. Comparative studies on respiration XX. The 
cause of partial recovery. peer Gen. Physiol. 4: 171-175. 
Fock, 25 -2O WN 192k. 
Jackson, H. S., & Mains, E. B. Aecial stage of the orange 
leafrust of wheat, Puccinia triticina Eriks. Jour. Agr. 
Research 22: 151-172. pl. 21 +f. 2. 15 O 1921. 
Jeffrey, E. C. The ar distribution of hybrids. 
Science II. 54: 517. 25 N1 
Johnson, D. S. Invasion of o soil in the tropics. Bot. 
sag, Fe: 405-312; 7. 7, 2.°..15 1921. 
Johnson, D. S. Polypodium vulgare as an epiphyte. Bot. 
Gaz. 72: 237-244. f. 1-3. 15 O 1921. 
Jones, F. R., & Tisdale, W.B. Effect of soil temperature upon 
the development of nodules on the roots of certain legumes. 
Jour. Agr. Research 22: 17-31. pl. 1-3 + f. 1-4. 1O 1921. 
Jones, L. R., & Doolittle, S.P. Angular leaf-spot of cucumber. 
Phytopathology 11: 297, 298. 15 N 1921. 
Jones, L. R., & Keitt,G.W. Eugene Washburn Roark. Phyto- 
pathology 11: 327. 9 D 1gat. 
Kempton, J. H. Heritable characters of maize. III. Bra- 
chytic culms. V. Adherence. Jour. Heredity 11: IfI- 
115. f. 12. 6 My 1920; 11: 317-322. f. 16-19. 23 Mr 1921. 
Kempton, J. H. Heritable characters of maize. VIII. White 
sheathes. Jour. Heredity 12: 224-226. f. 18. 23 S 1921. 
Kendrick, J. B., & Gardner, M. W. Seed transmission of soy- 
bean hariacal blight. Phytopathology 11: 340-342- pl. 
17; 9 D i921. 
