140 



The authors acknowledged the assistance of Dr. J. E. Kirk- 

 wood (1872 1 ( >2S ) . who was professor of botany at the Univer- 

 sity of Montana at the time, and referred to some previous stud- 

 ies, including one on Polycarpaea sfrirostylis, the so-called copper 

 plant <>t" Queensland. 4 There is a bibliography of 24 titles, aboul 

 half of them foreign, and all lacking authors' initials and com- 

 plete page numbers. The average year of publication of the 

 papers whose dates are given is 1900. 



The second paper of ecological interest is by Robert H. 

 Cuyler, of the department of geology of the University of 

 Texas, on Vegetation as an indicator of geological conditions, 

 in the Bulletin of the American Association of Petroleum Geol- 

 ogists, 15:67-68, figs. 1-12. January, 1931. The work was done 

 in the vicinity of Austin, where there are several different Cre- 

 taceous formations, all calcareous. A fault running approxi- 

 mately north and south near the city separates the Edwards 

 Plateau on the west from the black prairie (a part of the coastal 

 plain) on the east. 5 



The author recognizes eight different formations, mostly 

 fairly hard limestones, in the plateau region, and four, mostly 

 marls and clays, in the coastal plain. There is one half-tone il- 

 lustration of typical vegetation of each formation, and lists of a 

 few trees and shrubs characteristic of each, prepared with the 

 assistance of B. C. Tharp, professor of botany in the same in- 

 stitution. The different formations in each group are so much 

 alike that any one not a geologist would hardly notice the differ- 

 ences, but Dr. Cuyler has made some surprisingly definite 



tion close by has been almost completely destroyed, and the effects on trees 

 and crops have been noticed some distance into Georgia, which a generation 

 or so ago caused some acrimonious discussions, and threats of litigation by 

 Georgia against Tennessee. There seems to be little or no reference to this in 

 botanical literature, and only a little in geological literature. See L. C. Glenn, 

 Science II. 23: 288. Feb. 23, 1906; also page 11 of my Natural Resources of 

 Georgia (Bull. Univ. Ga., Vol. 30, no. 3. Feb. 1930). 



4 They seem to have had only a second-hand reference to this, but the 

 original study, together with an earlier work of similar nature not listed by 

 Bateman and Wells, was cited by me in a paper on Vegetation and mineral 

 deposits, in the Engineering and Mining Journal (New York), 112: 693-694 

 Oct. 29, 1921. (Abstracted in the Literary Digest, Nov. 19, 1921.) 



5 For some earlier notes on the same neighborhood, by the present writer, 

 with references to previous literature, see Bull. Torrey Bot. Club 47: 295-297. 

 1920. 



