550 PROCEEDINGS OF THE SAINT LOUIS MEETING 



broken surface, rising gradually from a height of 6,000 feet at Durango to about 

 9,000 feet farther west. It then slopes toward the Pacific and is deeply dissected 

 by streams. Evidence is adduced to show a rather rapid eastward movement of 

 the divide. 



The region is for the most part comparatively arid, although on the western edge 

 of the plateau extensive forests occur. The rocks are largely eruptive. The Cerro 

 Mercado or " Iron mountain" is described in some detail and its origin discussed, 

 as is also the area of remarkable forms produced by erosion known as the " City 

 of Rocks." 



This paper is published in Publications Field Columbian Museum, 

 Geological series, volume 2, number 5. 



In discussion of the paper remarks were made by W. M. Davis, the 

 President, and the author of the paper. 



The second paper was 



STUDIES IN THE AMMONOOSAC DISTRICT OF NEW HAMPSHIRE 



BY C H. HITCHCOCK 



Remarks were made on the paper by W. H. Hobbs. The paper is 

 printed as pages 461-482 of this volume. 



The third paper presented was 



FINGER LAKE REGION OF WESTERN NEW YORK 

 BY CHARLES R. DRYER 



The paper was discussed by H. L. Fairchild, W. M. Davis, R. D. Salis- 

 bury, R. S. Tarr, S. Calvin, and the author. It is printed as pages 449- 

 460 of this volume. 



The following paper was read by title : 



FOSSIL WATER FUNGUS IN PETRIFIED WOOD FROM EGYPT 



BY ALEXIS A. JULIEN 



[Abstract'] 



A description is given of a specimen of silicified wood from a " petrified forest" 

 near Cairo, and the mode of distribution of the fungus throughout its ducts. An 

 interesting association of crystals of hematite and of pseudomorphs after gypsum 

 and halite occurs, which testifies to the earlier conditions of petrifaction. The 

 organic forms have been preserved in remarkable perfection and abundance. 

 These are successively described, comprising discoid spores, an articulated macro- 

 mycelium, macrosporanges inclosing sporules, micromycelium bearing three forms 

 of stalked cells, and large ovate capsules carrying the spores first described, a con- 

 tinuous series which apparently represents the life history of the new organism. 

 Its generic relationships and genetic local history are then discussed. 



