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been neglected. No matter what kind of rock, the ecological conditions will be 
much the same in the initial stages of erosion, and, consequently, the plants will be 
similar; while in the last stages of life history, the plants and conditions will be 
exactly the same. The vegetation of all hills in a given region, of whatever 
chemical or physical nature, is tending toward an ultimate common destiny, which 
in most parts of the United States is the Mesojdiytic forest. The succession of 
plant societies is sometimes slow and sometimes fast, and hence we have, at any 
given period before the ultimate stage is reached, a difference in soils. Were the 
stages equally rapid in all cases, there would be no such differences. 
The author’s researches comprise studies made on granites, gneisses, basalts, 
&c., in northern Michigan and in Connecticut, on quartzites in northern Michigan, 
and in Montana; sandstones in northern Michigan, northern Illinois, and in eastern 
Tennessee ; shales in the Cumberland mountains of eastern Tennessee ; and limestone 
and dolomites in Illinois, Wisconsin, Tennessee and Montana (H. N. Whitford). 
This is given as a reminder of the great store of American contributions to this 
subject. 
10. It. II. Cambage has several references in Proc. Linn. Soc. N.S.W., xxvi 
(1901), viz., p. 201 (last six lines), concerning E. Morrisi, &c. At p. 207 the 
flora of sedimentary hills is compared with local hills of porphyry, and at p. 317 we 
have further notes on the same subject. 
11. In my Presidential Address, read before the Linnean Society of New South 
IVales, 1902, under the heading, “ Adaptability of Plants to certain Geological 
Formations” ( Proc. Linn. Soc. N.S.W., xxvi, 772) will be found a brief biblio¬ 
graphic survey which may be referred to. 
12. In Proc. Linn. Soc. N.S.W., xxvii (1902) we have, at pp. 577 and 579, 
notes on Kurrajongs and limestone (R. H. Cambage). 
13. In a paper, “ The Geology of the Glass-house Mountains and District,” 
by H. I. Jensen {Proc. Linn. Soc. N.S.JV., xxviii, 842, 1903), are some notes on 
“ the close correspondence ” between the vegetation and geological formation in the 
East Moreton district (Queensland) (p. 848), and some plants are cited. 
14. In Proc. Linn. Soc. N.S.JF., xxix (1904) we have, at p. 782, a note 
on Angophora lanceolata, and at p. 792 similar phyto-geological notes on Eucalyptus 
sideroxylon, by R. H. Cambage. 
15. “The occurrence of Casuarina stricta, Ait., on theNarrabeen shales,” by 
R. H. Cambage {Proc. Linn. Soc. N.S.JF., xxx, 376, 1905), is most valuable. A 
few other species are incidentally referred to. See also p. 214 (last paragraph) of the 
same volume for a brief note. 
16. t£ Climatic and geological influence on the Flora of New South IVales,” 
R. H. Cambage {Proc. Aust. Assoc. Ado. Science, Vol. xi, Adelaide, 1907)—a 
valuable and comprehensive paper, with specific instances of the formations which 
plants, chiefly trees, prefer, and its value is enhanced by a short bibliography. 
