SELECTED READING REFERENCES 
Classification of Plants, by J. D. Hooker (in La Maout & Decaisne, 
System of Botany, 987-994.—1873). Classification and Morphology, by 
Charles Darwin (in The Origin of Species, vol. 2:202-238,—ed. of 1899). 
The Natural History of Plants, by Anton Kerner, translated by D. 
Oliver (vols. 1 and 2. 1902). Plant Geography upon a Physiological 
Basis, by A. F. W. Schimper (1903). Lectures on Plant Physiology, by 
Ludwig Jost (1907). Herbals, their Origin and Evolution, 1470-1670, by 
Agnes Arber (1912). The Early Naturalists; their Lives and Work, 
1530-1789 (1912). Plant Geography, by G. S. Boulger (1912). Makers 
of British Botany, by F. W. Oliver (1913). History of Botany in the 
United Kingdom, 1860-1900, by J. R. Green (1914). The Phylogenetic 
Taxonomy of Flowering Plants, by C. E. Bessey (in Annals of the Mis¬ 
souri Botanical Garden, vol. 2:109-164,—1915). Outlines of the His¬ 
tory of Botany, by R. J. Harvey Gibson (1919). Distribution of Vegeta¬ 
tion in the United States as related to Climatic Conditions, by B. E. 
Livingston and F. Shreve (Carnegie Institution Publications, no. 284,— 
(1921). Age and Area; a Study in Geographical Distribution and Origin 
of Species, by J. C. Willis (1922). 
Coffee Berry (Rhamnus californica 
Esch.). The bark is used as a sub¬ 
stitute for Cascara Sagrada; as a laxa¬ 
tive drug it has essentially the same 
principles. 
