FOKEST BOTANY 153 



McCool, M. M. (3019) 

 sandy soils of northern Michigan. Mich. Agi\ Expt. Sta. Quart. Bull. 

 6 (2) : 64-66, illus. 1923. 



McDougall, W. B. (3020) 



A COMPARISON OOF SOIL TEMPERATURES IN UPLAND AND BOTTOMLAND FORESTS. 



111. State Acad. Sci. Trans. 13 : 249-254. 1920. 

 (3021) 



FORESTS AND SOILS OF VERMILLION COUNTY, ILLINOIS, WITH SPECIAL REFERENCE 



to the "STRIPLANDS." Ecology 6 (4) : 372-379. 1925. 



McKibbin, R. R. (3022) 



forest soils of eastern canada. Canacl. Woodlands Rev. 1 (8) : 9-10, 

 30-34; (9) : 9-10, 24-26, illus. 1929-30. 



Mattoon, W. R. (3023) 



FOREST LITTER A GOOD FERTILIZER OF FARM AS WELL AS TREE CROPS. U. S. 



Dept. Agr. Yearbook 1928 : 325-326, illus. 1929. 



(3024) 



SIIORTLEAF AND LOBLOLLY PINE LITTER AND HUMUS A VALUABLE FERTILIZER. 



U. S. Dept. Agr., Forest Worker 5 (2) : 14-15. 1929. 

 Millar, C. E. (3025) 



COMPARATIVE RATE OF FORMATION OF SOLUBLE MATERIAL IN CROPPED AND VIRGIN 

 SOILS AS MEASURED BY FREEZING POINT METHODS. Soil Sci. 7 I 253. 1919. 



Moore, Bakrington. (3026) 



influence of certain soil and light conditions on the establishment 



OF REPRODUCTION IN NORTHEASTERN CONIFERS. Ecology 7 I 191-220 1 , illUS. 



1926. 

 ■ (3027) 



INFLUENCE OF CERTAIN SOIL FACTORS ON THE GROWTH OF TREE SEEDLINGS AND 



wheat. Ecology 3: 65-83. 1922, 



(3028) 



the moisture with holding power of soils. (Review of several publica- 

 tions.) Jour. Forestry 15: 110-117. 1917. 



(3029) 



soil factors and plant growth. Ecology 3 : 65-83, illus. 1922. 



Morrow, C. A. (3030) 



THE ORGANIC MATTER OF THE SOIL J A STUDY OF THE NITROGEN DISTRIBUTION 



in different soil types, 79 pp. Minneapolis. 1918. 



Morse, F. W. (3031) 



humus in new Hampshire soils. N. H. Agr. Expt. Sta. Bull. 138, 15 pp., 

 illus. 1908. . 



Neidig, R. E., and Snyder, R. S. (3032) 



THE CAUSE OF LOW PRODUCTIVITY IN RECENTLY CLEARED CONIFEROUS TIMBER 



soils. 1st Internatl. Cong. Soil Sci., Proc. and Papers 3: 525-541, illus. 

 1927. 



Nichols, H. M. (3033) 



soil requirements of forest trees, Forest Leaves 22 (12) : 188-191. 1930. 



Perry, G. S. (3034) 



calcium, the key to forest productivity. Jour. Forestry 26: 767-773. 



1928. 



Perry, W. J. (3035) 



SOME OBSERVATIONS ON THE RELATION OF SOIL MOISTURE TO HEIGHT GROWTH 



in yellow pine saplings. Jour. Forestry 19 : 752-753. 1921. 



Robinson, W. C, Steinkoenig, L. A., and Fry, W. H. (3036) 



variation in the chemical composition of soils. U. S. Dept. Agr. Bull. 

 551, 16 pp. 1917. 



Romell, L. G. (3037) 



FOREST SOIL RESEARCH IN RELATION TO FORESTRY, WITH PARTICULAR REFERENCE 



to the northeast. Jour. Forestry 28: 841-848. 1930: 



