BOTANY. 



No. 8. FARLOW, W. G. Bibliographic Index of North American Fungi. Octavo, 

 Vol. 1, part 1, xxxv+312 pages. Published 1905. Price $2.00. 



A compilation of the references to species of fungi in North America southward 

 to the Isthmus of Panama and including the West Indies. The above is only 

 about one-fourth of the projected work which can not be carried farther. 



No. 15. MOTHER D. M. Fecundation in Plants. Octavo, vm-f 187 pages, 75 text 



figures. Published 1904. Price $1.50. (Out of print.) 



The subject of fecundation in plants is presented by a discussion of the more 

 thoroughly investigated concrete cases. 



No. 6. COVILLE, F. V., and D. T. MACDOUGAL. Desert Botanical Laboratory of 

 the Carnegie Institution. Octavo, vi-f-58 pages, 29 plates. Published 

 1903. Price $0.50. 



A discussion of the general features of deserts with respect to the climate and 

 soil formations, together with a presentation of the principal problems presented by 

 the specified forms of plants which characterize arid areas. Detailed descriptive 

 sketches are given of the arid regions in western Texas, the sand dunes of Chi- 

 huahua, the Tularosa desert, Nogales, Torres, Guaymas, the Colorado and Mohave 

 deserts, the Grand Canyon of the Colorado, and the Tucson region. 



No. 99. MACDOUGAL, D. T. Botanical Features of North American Deserts. Oc- 

 tavo, 115 pages, 62 plates, 6 figures. Published 1908. Price $1.75. 



The more important features of deserts in North America from the Great Basin 

 in Nevada to southern Mexico are described and amply illustrated. The initial 

 investigations by the members of the staff of the Desert Laboratory in the Salton 

 Basin are given, as well as various other physiological and geographical researches. 

 Especial attention is given to the Tucson region, the geology of which was contrib- 

 uted by Prof. W. P. Blake. Some consideration is also given to soils, temperatures, 

 conditions contributory to deserts, and environmental relations to desert plants. 



No. 24. MACDOUGAL, D. T., A. M. VAIL,, G. H. SHULL, and J. K. SMALL. Mutants 

 and Hybrids of the Oenotheras. (Paper No. 2, Station for Experi- 

 mental Evolution.) Octavo, 57 pages, 22 plates. Published 1905. Price 

 $1.00. (Out of print.) 



An account of cultural investigations of the evening primroses for the purpose of 

 testing the recurrence and stability of mutants, and an estimation of their fluctuating 

 variability compared with the parental type. 



No. 81. MACDOUGAL, D. T., A. M. VAIL, and G. H. SHULL. Mutations, Variations, 

 and Relationships of the Oenotheras. (Paper No. 9, Station for Ex- 

 perimental Evolution.) Octavo, 92 pages, 22 plates, 73 text figures. 

 Published 1907. Price $1.00. 



Includes a continuance of the investigations described in No. 24. The identity, dis- 

 tribution, >and coefficient of mutability of Lamarck's evening primrose are discussed. 



No. 141. MACDOUGAL, D. T., and E. S. SPALDING. The Water-balance of Succu- 

 lent Plants. Octavo, iv+77 pages, 8 plates, 16 text figures. Published 

 1910. Price $1.00. 



This book contains the results of several years' measurement of various cacti 

 by which their form-alterations and growth were apprehended. The massive bodies 

 of Carnegiea, Opuntia, and Echinocactus undergo alterations in volume and form 

 with the increase or decrease of the soil-moisture and evaporation, these changes 

 being modified to some extent by insolation and air-temperatures. The external 

 folds of Carnegiea (the tree cactus) and Echinocactus (melon cactus) allow rapid 

 expansion and contraction of their great trunks, and observations upon these move- 

 ments for several years are given. The results of variations in the amount and 

 composition of the water-balance carried by desert plants are also shown. The 

 depletion of the water-balance is accompanied by reversible changes of form; its 



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