BIBLIOGRAPHY 247 



WALLACE, A. R. The World of Life: Chapman and Hall, 



1910, 408 pp. 110 figures, 8vo. 



Interesting, as giving the latest views of one of the founders 

 of the theory of Natural Selection. 



WIELAND, G. R. American Fossil Cycads: Carnegie Insti- 

 tution, 1906, 296 pp., 50 plates and many figures, 4to. 

 A magnificent work, giving the full results of the author's 

 classical researches, with comparative observations on modern 

 Cycads, etc. 



ZEILLEH, R. Les Progres de la Paleobotanique a 1'fire dea 

 Gymnospermes: Progressus Rei Botanicae. Vol. II, 1907, 

 56 pp. 8vo. 

 An article giving ah 1 the recent results of the investigation of 



the Mesozoid floras. 



