ALTAMAHA GRIT REGION OF GEORGIA 353 



Harshberger, J. W. The comparative age of the different floristic ele- 

 ments of Eastern North America. Proc. Acad. Nat. Sci. Phila, 

 56: 601-615. Oct. 1904. 

 Largely a compilation of the phytogeographical work of several writers , 

 from which some interesting but not always obvious conclusions are 

 drawn. 



Harshberger, J. W. Methods of determining the age of the different 

 floristic elements of Eastern North America. Rep. 8th Int. Geog. 

 Cong. 601-607. I 9°5- 

 Essentially an abridgment of the preceding paper. 



Hildebrand, F. Die Verbreitungsmittel der Pflanzen. 162 pp. 8 figs. 

 Leipsic, 1873. 



Hilgard, E. W. Report on the Geology and Agriculture of the State of 

 Mississippi, xxiv+391 pp. & map. Jackson, i860 (published by 

 the state) . 

 Contains an excellent discussion of the details of geology, soil 

 topography, vegetation, and the relations between them, for nearly 

 all parts of the state. But for the fact that plants are mentioned 

 in this work only incidentally, and no complete enumeration of them 

 is attempted, this would be one of the most satisfactory local floras 

 ever published. 



Hilgard, E. W. Soil studies and soil maps. Overland Monthly (3-12) , 

 Dec, 1 89 1. 



Hill, E. J. Means of plant dispersion. Am. Nat. 17: 811-820, 1028-1034. 

 1883. 

 Contains much of interest to phytogeographers. 



Hitchcock, A. S. Ecological plant geography of Kansas. Trans. Acad. 

 Sci. St. Louis 8:55-69. Map. March 8, 1898. 

 This seems to be the first of the now rather numerous American works 

 containing the word "ecological" in its title. 



Hitchcock, A. S. A brief outline of ecology. (Presidential address.) 

 Trans. Kans. Acad. Sci. 17: 28-34. 1901. 



Hollick, Arthur. The relation between forestry and geology in New 

 Jersey. (Report on forests, in) Ann. Rep. State Geol. N. J. for 

 1899, 177-201. 1900. Also essentially the same in Am. Nat. 

 33: 1-14, 109-116. 1899. 

 A very interesting discussion of the causes affecting distribution of trees. 



Jackson, Joseph. Through Glade and Mead: a contribution to local 

 natural history. (With a flora of Worcester County, Massachusetts.) 

 xiv + 332 pp. and several full-page illustrations (9 half-tones in the 

 regular edition and about a dozen platinum prints in the special). 

 Worcester, 1894. 

 Although this deals with a region very different from that here dis- 

 cussed, and from a very different standpoint, I have derived much 



