44 MASS. EXPERIMENT STATION BULLETIN 382 



49. Hitchcock, A. E., and Zimmerman, P. W. Comparative activity of 

 root-inducing substances and methods for treating cuttings. Boyce 

 Thompson Inst. Contrib. 10:461-480. 1939. 



50 and Zimmerman, P. W. Effects obtained with mix- 

 tures of root-inducing and otiier substances. Boyce Thompson 

 Inst. Contrib. 11:143-160. 1940. 



51. Hottes, Alfred C. Book of Shrubs. New York. 1937. 



52. Hutchings, G. C, and Larson, J. A. Stimulation of root growth on 



cuttings from hardwood forest trees. Proc. Iowa Acad. Sci. 

 36:191-200. 1929. 



53. Johnston, Stanley. The propagation of highbush blueberry. Mich. 



Agr. Expt. Sta. Spec. Bui. 202, 22pp. 1930. 



54 The influence of certain hormone-like substances 



on the rooting of hardwood blueberry cuttings. Mich. Agr. Expt. 

 Sta. Quart. Bui. 21:4:255-258. 1939. 



55. Judd, William H. Ornamental shrubs of merit. Proc. Ann. Meet. 



Amer. Plant Prop. Assoc. July 16, 1929:15-28. 1929. 



56. Kemp, W. L. S. Observations on cuttings of a variety lilac. Sci. 



Agr. 9:216-230. 1928. 



57. Kiplinger, D. C. Further studies on the eflfect of synthetic growth 



substances. Rooting of woody ornamental plants. Ohio State 

 Univ. Nursery Notes 7:12:1-12. 1938. 



58. Kirkpatrick, H., Jr. Latest information concerning root-inducing 



substances and approved methods of using them. South. Florist 

 and Nurseryman 47:4:7, 22-24. 1939. 



59 The use of root-inducing substances. Florists' Exch. 



92:14:13, 18. 1939. 



60 Propagation of lilacs on own roots. Amer. Nursery- 

 man 69:7:3-4. 1939. 



61 Rooting evergreens with chemical. Amer. Nursery- 

 man 71:8:9-12. 1940. 



62 Rooting rose cuttings with chemicals. Amer. 



Nurseryman 72:10:709. 1940. 



63. Knight, F. P. The propagation of magnolias. New Flora and Silva 

 1:193-199. 1929. 



64 Some interesting woody plants from cuttings. New 



Flora and Silva 4:160-163. 1932. 



65. Komissarov, D. A. Applying of growth substances to increase the 



rooting capacity in cuttings of woody species and shrubs. Compt. 

 Rend. (Doklady) Acad. Sci. U. R. S. S. 18:63-68. 1938. 



66. Laurie, Alex. The use of peat in the greenhouse. Mich. Agr. Expt. 



Sta. Spec. Bui. 194, 28 pp. 1930. 



67 and Chadwick, L. C. The Modern Nursery. New 



York. 1931. 



68. Lek, H. A. A. van der, and Krijthe, Eltien. Stimulation of the 



rooting of cuttings by growth substances. (Transl. title.) (English 

 summary.) Meded. Landbouwhoogeschool, VVageningen 41:1-50. 

 1937. 



69. Longley, L. E. Effect of growth substances and maturity on rooting 



of cuttings of certain shrubs. Proc. Amer. Soc. Hort. Sci. 36 

 (1938):827-830. 1939. 



70 Growth substance in rooting certain Prunus species. 



Proc. Amer. Soc. Hort. Sci. 2>1 (1939) :1091-1092. 1940. 



