324 GEORGE B. RIGG 



(32) Livingston, B. E. Physical properties of bog water. Bot. Gaz. 37: 



383-385. 1904. 



(33) Livingston, B. E. Physiological properties of bog water. Bot. Gaz. 



39: 348-355. 1905. 



(34) Nabokish, a. J. Ueber die Wachstumsreise. Beih. Bot. Centralb. Erste 



Abt. 26: 7-149. 1910. 



(35) Nichols, G. E. The vegetation of Connecticut. IV. Plant societies 



in the lowlands. Bull. Torr. Bot. Club. 42: 169-217. 1915. 



(36) NiLssoN, N. H. Einiges fiber die Biologie der schwedishen Sumpfpflanzen. 



Bot. Centralb. 76: 9-14. 1898. 



(37) Nilsson, a. Om Norrbottens myrar och forsumpade skogar. Tidskrift 



for Skogshushaltning. 1897. Also Separat-Abdruck, 20 pp. Stock- 

 hohn. 1897. 



(38) Pennington, L. H. Plant distribution at Mud Lake. Rept. Mich. Acad. 



Sci. 8: 54-63. 1906. 



(39) Peterson, H. E. The structure and biology of arctic flowering plants. 



Meddel. om Gronland. 36: 75-138. 1908. 



(40) Peterson, O. G. Diagnostik Vedanotomie N. V. Europas Traer og 



Buske. Kobenhavn. 1901. 



(41) Rigg, G. B. The effect of some Puget Sound bog waters on the root hairs 



of Tradescantia. Bot. Gaz. 55: 314-326. 1913. 



(42) Rigg, G. B. Notes on the flora of some Alaskan sphagnum bogs. PI. 



World 17: 167-182. 1914. 



(43) Rigg, G. B. The toxicity of bog water. Am. Jour. Bot. 3: 436-437. 1916. 



(44) Rigg, G. B., Trumbull, H. L., and Lincoln, Mattie. Physical prop- 



erties of some toxic solutions. Bot. Gaz. 61: 408-416. 1916. 



(45) Robinson, C. S. Organic nitrogenous compounds in peat soils. II. 



Mich. Agr. Coll. Exp. Sta. Tech. Bull. 7, 1911. 



(46) Skene, M. The acidity of sphagnum and its relation to chalk and mineral 



salts. Ann. Bot. 29: 65-87. 1915. 



(47) ScHREiNER, O., AND Shorey, E. C. Chemical nature of soil organic 



matter. U. S. Dept. Agr. Bur. Soils Bull. 74. 1910. 



(48) Shaw, C. H. The development of vegetation in the morainal depressions 



in the vicinity of Wood's Hole. Bot. Gaz. 33: 437-450. 1902. 



(49) Schreiner, O. The organic constituents of soils. Science N. S. 36: 577- 



587. 1912. 



(50) Schwendener, S. Die Spaltoffung der Gramineen und Cyperaceen. Sit- 



zungs. Preuss. Akad. Wiss. Berlin. 1889. 



(51) Sitensky, F. Ueber die Torfmoose Bohmens. Arch, der Naturw. Landes- 



durchforschung. Bohmen 6: 228. 1891. 



(52) Schimper, a. F. W. Plant geography upon a physiological basis. Ox- 



ford. 1903. 



(53) Skinner, J. J. and Beattie, J. H. Effect of asparagin on absorption 



and growth in wheat. Bull. Torr. Bot. Club, 39: 429-437. 1912. 



(54) Solereder, H. Systematische Anatomie der Dicotyledonen. F. Euke. 



Stuttgart. 1908. English edition. 1899. 



(55) Transeau, E. N. On the geographical distribution and ecological rela- 



tions of the bog plant societies of North America. Bot. Gaz. 36: 401- 

 420. 1903. 



