192 



THE AMERICAN NATURALIST [Vol. XLI 



chiefly in Tertiary times, and the agreement of the zoogeographical 

 facts with paleontology and geology tends to show, that these recon- 

 structions of the old continents are not merely wild speculations. 

 However, the results cannot yet be accepted as final, and although 

 some of the major features of old geography must be regarded as well 

 established, much remains to be done in detail. Chief of all, additional 

 groups of animals should be studied, and an attempt should be made 

 to correlate the results obtained by them with those of Ortmann and 

 Matthew; and further, attention should also be paid to the Mesozoic, 

 and if possible, Paleozoic times. It is to be hoped that, for instance, 

 the distribution of certain molluscs and lower vertebrates may fur- 

 nish evidence with regard to these ages, although it is only natural 

 that this task will be much more difficult, since the facts are very 

 scanty, and their meaning is largely obscured by the changes in 

 subsequent times. 



A. E. O. 



The Mountains of Cape Colony. — In the Cape Colony, southern 

 Africa, are ranges of folded mountains very similar to the Alleghenies 

 of the eastern United States. During the summer of 1905 Professor 

 Davis had an opportunity to study the Cape Colony ranges while a 

 guest of the British Association for the Advancement of Science dur- 



geologists and geogra pliers, l)ecimse of the striking similarity, in 

 practically all essential features, of the two widely separated moun- 

 tain groups, whether compared as to structure, the relation of folded 

 areas to undisturbed plateaus, the erosion history and development 

 of drainage adjustments, or the control exerted by the physiographic 

 features upon transportation, etc. In climate, however, a marked 

 contrast between the two localities exists. The paper is illustrated 

 by a number of drawings and photographs. 



D. W. J. 



Natural Mounds.-— During the hist two years a luimlier of j)apers 



14, 708-717, 



