PAPERS OX BIOLOGY AND AGRICULTURE 207 



size. Every oue of us is within striking distance of some 

 sort of a river canyon, perhaps in our o^^'n home county, 

 certainly within week-end fii\"vering distance. If there is 

 anyone who is casting about for something promising 

 in field botany, I for one, having made proof of the pud- 

 ding, can assure him that it is most excellent eating. 



LITERATURE CITED. 



1. Cowles. H. C: The ecological relations of the vegetation on the 



sand dunes of Lake Michigan. Bot. Gaz. 27: 95-117, 167-202, 281- 

 308. 361-391. 1S99. 



2. Fuller. G. D.: Evaporation and plant succession. Bot. Gaz. 52: 



192-217. 1911. 



3. Puller. G. D. : Evaporation and soil moisture in relation to the 



succession of plant associations. Bot. Gaz. 58: 193-234. 1914. 



4. Cowles. H. C: Ecological floristics in the Chicago region. (In 



preparation.) 



5. Griees. R. P.: A botanical survev of the Sugar Grove region. 



Ohio Biol. Surv. Bull. 3. 1914. 



6. Pepoon. H. S.: A proposed new state park. Trans. 111. State Acad. 



Sci. 12: 64-68. 1919. 

 6a- Pepoon. H. S.: The forest lands of Jo Daviess Countv. Trans. 

 111. Acad. Sci. 12: 183-202. 1919. 



7. Sauer. C. O.. G. H. Cady and H. C. Cowles: Starved Rock State 



Park and its environs. Geogr. Soc. of Chicago Bull. 6. 1918. 



8. (Iowa) State Board of Conservation: Iowa Parks. Des Moines. 



1919. 



