LE LABORATOIRE DÉSERTIQUE DE TUCSOX (aRIZONA) 117 



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— The parasitism of Orthocarpus purpiirascens Benth. Plant World. 

 vol. Xll, nov. 1909. 



— Un the root-system of Cereus giganteus. Pub. 113 (p. 39). Carneg. 

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— A reedwood sport. Plant World, vol. XI, p. 232, 1908. 

 KiRKWoOD, J. E. — The Guajnile rubber industry. Scientific american, 



vol. CI, p. 24, 1909. 



LiviNGSTOx, B. E — Soils of the Désert Laboratory domain. Publ., 113 

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— Présent problems of plants ecology. Plant World, vol. XII. p. 41 

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— Rôles of the soil in limiting plant activities. Plant World, vol. XII, 

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— A repeated cycle in assimilation. Plant World, yo\. XII, p. 66 (1909). 



— Stomata and transpiration in Tradescanlia. Science, n. s., vul. XXIX, 

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— The heath of Luerireberg. Plant World, vol. XII, p. 231 (1909). 

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— Methods of reproductive végétative reproduction in Guayule and 

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— The Mexican Guayule ani its products. Lectures on ïndia-rubber ; 

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Mac Dougal, D. T. — The direct influence of environment. Fifty years 

 of Daricinism, p. 11 i. New York, 1909. 



— The originalion of self-generating matter and the influence .if aridity 

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— The origia of désert floras. Publ. 113 (p. 119 . Carnegie Inst. of 

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— The influence of aridity upon the evolutionary development of plants. 

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Sp.vldisg, V. M. — Problems of locil distribution in arid régions. 

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— GuPivated plants in the arid Southwest. Plant World, vol. Xll, 

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Thornber, J. J. — Végétation groups of the Désert Laboratory domain. 

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Tolman, g. j. — ïhe geology of the vicinity of the Tumanoc Hills. 

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