In their monumental work "The Cactaceae", BRITTON and ROSE (I9) record 1235 species belonging to the three tribes which constitute the family of the Cacti. The actual number of the species must be con siderably higher. Cacti occur frequently in tlie more arid and less accessible regions of the American Continent, nearly always within very narrow and definite borderlines. The habitat of a species is in many instances a single valley located in a remote, uninhabited region of the Cordillera. Thus the collection of flowering specimens fit for botanical identification is some times extremely difficult. On the other hand, cacti are apt to develop individual variations in their characteristic morphological features, rendering the definition of a species difficult and often illusory. Specimens taken from their normal habitat to botanical gardens or arboreta often die, degenerate or stop flowering. Taking into account all these difficulties, it is not surprising to find considerable differences of opinion among botanists on the taxonomy of the cactaceae. A considerable number of species have not been well defined and in many cases different names have been given to the same species. The index of BRITTON and ROSE records not less than 7000 binomials.
Inhaltsverzeichnis
Some Biochemical and Nutritional Aspects in Fat Chemistry. - I. Introduction. - II. Nutritional Evaluation of Fats in General. - III. Comparison of the Nutritional Value of Animal and Vegetable Fats. - IV. Conclusions. - References. - Odeurs et parfums des animaux. - Rôle de l odeur dans le regne animal. - Drogues animales utilisées en parfumerie. - I. Produits d excrétion des glandes sébacées. - II. Concrétions intestinales. - III. Substances odorantes de l urine de Vertébrés. - IV. Fèces. - Conclusions. - Bibliographie. - Vorkommen und biochemisches Verhalten der Chinone. - Wien. - I. Natürlich vorkommende Chinone. - II. Biologische Wirkungen der Chinone. - Schlußbemerkung. - Cactus Alkaloids and Some Related Compounds. - I. Introduction. - II. Historical. - III. Occurrence of Alkaloids in Cacti. - IV. Location of the Alkaloids in Tissues of the Cacti. - V. Extraction and Isolation of Cactus Alkaloids. - VI. The Chemistry of the Cactus Alkaloids and Some Related Natural Bases. - VII. Biogenesis of the Cactus Alkaloids and Their Relationship to Other Natural Products. - VIII. Pharmacological Effects of Cactus Alkaloids and Some Related, Naturally Occurring Bases. - References. - Plant Proteins. - I. Introduction. - II. Proteins of Cereal Seeds. - III. Proteins of Seeds of Dicotyledenous Plants. - IV. The Leaf Proteins. - V. Proteins of Tissues Other than Leaves. - VI. Conclusion. - References. - Progrès récents en spectrochimie de fluorescence des produits biologiques. - I. Avant-propos. - II. Hydrocarbones (glucides) et glucosides. - III. Stérols et Stéroïdes. - IV. Protéines (protides) et aminoacides. - V. Pyrimidines, purines et ptérines. - VI. Thiamine (aneurine), thiochrome et thiazol. - VII. Adrénaline et adrénochrome. - VIII. Alcaloïdes. - IX. Polyphénols. - X. Dérivés del indol. - XI. Acide nicotinique et nicotylamide. - XII. Uroérythrine (uroroséine). - XIII. Chlorophylles. - XIV. Polyhydroxyanthraquinones et composés similaires. - XV. Lampyrine. - XVI. Carotène, phytofluène et vitamine A. - XVII. Pénicilline et streptomycine. - Appendice: La topographie spectrale dans l excitation des fluorescences (Spectrofluorescence). - Bibliographie. - Namenverzeichnis. Index of Names. Index des Auteurs. - Sachverzeichnis. Index of Subjects. Index des Matières.
