726 EDITORIAL 



the commemoration of the sixtieth anniversary of the great work 

 of Professor Hall on the geology and palaeontology of the state 

 of New York. Six decades of continuous service, and that, 

 nota befie, official service, with a hopeful outlook on the seventh, 

 is indeed a rare record. No work has been equally influential in 

 the correlation of the palaeozoic terranes of America, and none is 

 more worthy of the special honors so appropriately and so 

 happily bestowed. 



The synopsis of the papers given in Scie?tce indicates a pro- 

 gramme of much variety and value. The scientific interest 

 seems to have reached its climax in the discussions of Mr. Gil- 

 bert bearing upon the history of Niagara Falls, and in the 

 excursion connected therewith. The announcement of a third 

 postglacial outlet for the upper lakes is a matter of wide histor- 

 ical importance. The following is a list of the papers offered : 



"Notes on the Artesian Well sunk at Key West, Florida, in 1895." By 

 Edmund Otis Hovey. 



"The Hydraulic Gradient of the Main Artesian Basin of the Northwest." 

 By J. E. Todd. 



"The True Tuff-beds of the Trias, and the mud enclosures, the under- 

 rolling, and the basic pitchstone of the Triassic Traps." By B. K. Emerson. 



"Volcanic Ash from the North Shore of Lake Superior." By N. H. 

 Winchell and U. S. Grant. 



" The 'Augen-gneiss,' Pegmatite Veins, and Diorite Dikes at Bedford, 

 Westchester Co., N. Y." By Lea McL Luquer and Heinrich Ries. 



" The Tyringham (Mass.) 'Mortise Rock,' and Pseudomorphs of Quartz 

 after Albite." By B. K. Emerson. 



" The Succession of the Fossil Faunas in the Hamilton group at Eighteen 

 Mile Creek, N. Y." By Amadeus W. Grabau. 



" Development of the Ph3'siography of California ; Synopsis of California 

 Stratigraphy." By James Perrin Smith. 



"Ancient and Modern Sharks, and the Evolution of the Class." By E. 

 W. Claypole. 



" Observations on the Dorsal Shields in the Dinichthyids." By Charles 

 R. Eastman. 



"The Discovery of a new Fish Fauna, from the Devonian Rocks of 

 Western New York." By F. K. Mixer. 



" Notes on certain Fossil Plants from the Carboniferous of Iowa." By 

 Thomas H. Macbride. 



