128 



THE ECOLOGICAL RELATIONS OF ROOTS. 



BIBLIOGRAPHY. 



Alway, F. J,, et al. 1916, The loess soils of the Nebraska portion of the transition region. 



Soil Science 1 : Nos. 3, 4, 5. 

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. 1913. Botanical featvires of the Algerian Sahara. Carnegie Inst. Wash. Pub. No. 178. 



. 1918. The evaluation of the soU-temperature factor in root growth. Plant World 



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Clements, E. S. 1905. The relation of leaf structure to physical factors. Trans. Am. Mic. 

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. 1916. Plant succession. Carnegie Inst. Wash. Pub. No. 242. 



KoBSTiAN, C. F. 1917. The indicator significance of native vegetation in the determination 

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Markle, M. S. 1917. Root systems of certain desert plants. Bot. Gaz. 64: 177. 



Pool, R. J. 1914. A study of the vegetation of the sandhills of Nebraska. Minn. Bot. Studies 



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Pound, R., and F. E^ Clements. 1900. The phytogeography of Nebraska. 

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RoBBiNS, W. W. 1917. The botany of crop plants. 



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— . 1917. A study of the vegetation of southeastern Washington and adjacent Idaho. 



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woodland. Rep. Bot. Surv. Nebr., n. s. 1: 1. 



