FOREST BOTANY 155 



Zon, Raphael. (3058) 



silviculture as a factor in maintaining the fertility of forest soils. 

 1st Internatl. Cong. Soil Sci. Proc. and Papers 4: 575-582. 1928. 



(3059) 



the source of nitrogen in forest soil. Pop. Sci. Monthly 62 I 436-440. 1903. 



Forest Sold Biology 



Batchelor, H. W. f and Gibes, W. M. (3060) 



effect of tree products on bacteriological activities in soil: study of 

 forest sons. Soil Sci. 24 : 351-363. 1927. 



Baxter, D. V. (3061) 



MYCORRHIZA AND SCOTCH PINE IN THE UNIVERSITY OF MICHIGAN FOREST NURSERY. 



Mich. Acad. Sci. Papers 9 : 509-516, illus. 1928. 



(3062) 



A PRELIMINARY STUDY OF COLEOSPORIUM SOLIDAGINIS (SCHW.) THUM. IN FOREST 

 PLANTATIONS IN THE REGION OF THE LAKE STATES. Mich. Acad. Sci. Papers 



14 : 245-258, illus. 1930. 



Duthie, G. A., and Matthews, D. M. (3063) 



mycorrhizae on Michigan trees. (Abstract.) Mich. Acad. Sci. Ann. Kept. 

 10 : 46. 1908. 



Fuller, G. D. (3064) 



mycorrhiza of forest trees. Bot. Gaz. 73 I 506. 1922. 



Gibbs, W. M., and Batchelor, H. W. (3065) 



EFFECT OF TREE PRODUCTS ON BACTERIOLOGICAL ACTIVITIES IN SOIL J STUDY OF 



forest soils. Soil Sci. 24 : 351-363. 1927. 



and Werkman, C. H. (3066) 



EFFECT OF TREE PRODUCTS ON BACTERIOLOGICAL ACTIVITIES IN SOIL, 1 I AMMONIFI- 



oation and nitrifioation. Soil Sci. 13 (4) I 303-322. 1922. 

 Kelley, A. P. (3067) 



MYOORRHIZAL STUDIES, 1 : MYCORRHIZA OF MONT ALTO NURSERY STOCK. Jour. 



Forestry 28 : 34-^1, illus. 1930. 



(3068) 



MYCORHIZA STUDIES, 2 I THE DURATION OF CERTAIN PINE MYCORHIZAE. JOUT. 



Forestry 28 : 849-852. 1930. 



Loohhead, A. G. (3069) 



some trends in soil microbiology. Sci. Agr. 4 (10) l 308-313. 1924. 



Lohman, M. L. (3071) 



occurrence of mycorrhiza in iowa forest plants. Iowa Univ. Studies Nat. 

 Hist. 11 (10) : 33-58, illus. 1926. 



McArdle, R. E. (3072) 



determining the identity of mycorrhiza-forming fungi. Mich. Acad. Sci. 

 Papers 13 : 159-164. 1930. 



MacDougal, D. T. (3073) 



significance of mycorrhizas. Marine Biol. Lab., Biol. Lectures 1899: 

 49-56. 1900. 



McDougall, W. B. (3074) 



MYCORRHIZAS FROM NORTH CAROLINA AND EASTERN TENNESSEE. Amer. Jour. 



Bot 15 : 141-148, illus. 1928. 



(3075) 



MYcoRHizAS of coniferous trees. Jour. Forestry 20: 255-260, illus. 1922. 



(3076) 



on the mycorhizas of forest trees. Amer. Jour. Bot. 1 : 51-74, illus. 1914. 



(3077) 



symbiosis in a deciduous forest. Bot. Gaz. 73: 200-212; 79: 95-102; 86: 



226-234, illus. 1922-28. 



and Jacobs, M. C. (3078) 



TREE MYCORRHIZAS FROM THE CENTRAL ROCKY MOUNTAIN REGION. Amer. Jour. 



Bot. 14 : 258-266, illus. 1927. 



