1889.] NEW YORK ACADEMY OF SCIENCES. 25 



sound, while the coarser particles on the beaches yield a reso- 

 nance on smaller provocation. 



We have elsewhere (Proceedings Am. Assoc. Adv. Science, 

 1883 and 1884) shown that the pitch of the musical notes pro- 

 duced on sea-beaches is directly proportional to the mass of sand 

 moved. — the greater the mass the lower the tone ; on the Bell 

 Slopes in the desert the large mass moved yields a very deep 

 note. 



The lantern illustrations, — all from photographs recently 

 taken by Dr. Bolton, — comprised, besides a map of the region, 

 views of Tor and its vicinity; the scenery along the desert route 

 and on the shore of the Eed Sea ; the Jebel Xagous range, and 

 the Bell Slope itself ; the new slope of the Ojrat Eamadiin ; and 

 reproductions of two drawings previously published by travellers 

 (one English and one American), purporting to represent the 

 slope of Jebel Xagous, but extraordinarily inaccurate and mis- 

 leading, and widely different from each other I 



October 28, 1889. 



Stated Meeting. 



The President, Dr. Newberry, in the chair. 



Sixty persons present. 



The President made a reference to a very remarkable 

 series of discoveries in palaeontology recently made by Prof. 

 0. C. Marsh, of Yale College, in the Judith River beds of the 

 Laramie group. He had enjoyed the opportunity of examining 

 some of the material brought on by Prof. Marsh, and it was cer- 

 tainly of unusual interest. The most striking remains are those 

 of gigantic saurians, which present an extraordinary combina- 

 tion of characters, — skulls measuring seven feet in length, and 

 bearing a pair of laterally projecting horn-cores, that must have 

 supported horns much like those of Bovidse, though enormous 

 in size. The jaws are beaked after the manner of tortoises, and 

 also armed with downward-pointing teeth or tusks from the back 

 part of the upper mandible; while the head behind is extend- 

 ed into a sort of collar of bony si)ikes, directed backward, and 



