CONTENTS. V 



iSTumlber 105. 



Page 

 Aet. XXI. — Velocity of the Propagation of Magnetism ; by 



II. A. Perkins .., 165 



XXII. — Geomorphic Origin and Development of the Raised 

 Shore Lines of the St. Lawrence Valley and Great 

 Lakes ; by R. Chalmers, LL.D., of the Geological Sur- 

 vey of Canada . - 175 



XXIII. — Material and Shape of the Rotating Cathode ; by 



H. E. Medway b _ _ . 180 



XXIV. — Structure of the Upper Cretaceous Turtles of New 

 Jersey : Lytoloma ; by G. R. Wieland. (With Plates 

 V-VIII) 183 



XXV. — The root-structure of North American terrestrial 



Orchidese ; by T. Holm; (With figures in the text)... 197 



XXVI. — Study of the Structure of Paleozoic Cockroaches, 

 with Descriptions of New Forms from the Coal Measures; 

 by E. H. Sellards ... .. 213 



XXVII. — Electrotropism of Roots ; by A. B. Plowman. 



(With Plates IX and X) ... 228 



SCIENTIFIC INTELLIGENCE. 



Geology and Mineralogy — United States Geological Survey, 237. — Geologi- 

 cal Survey of Canada : Examination of the Coral-Rock Cores from the 

 Borings at Funafuti, J. W. Judd and C. G. Cullis, 239. — Brief notices 

 of some recently described Minerals, 242.— New York State Museum, 243. 

 Observations of a Naturalist in the Pacific, H. B. Guppy, 244. 



Miscellaneous Scientific Intelligence — Elements of Algebra for Beginners, G. 

 W. Hull : Elementary Algebra, J. H. Tanner, 244. 



