IY CONTENTS 



Number 20. 



Page 



Art. VIII. — Colloids in Geologic Problems ; by G. D. Hubbard, 95 



Art. IX. — Primitive Pecora in the Yale Museum; by R. S. 



Lujll, , Ill 



Art. X. — A Critical Phase in the History of Ammonites; by 



C. Diener, 120 



Art. XI. — Saccoglottis, Recent and Fossil; by E. W. Berry, 127 



Art. XII. — A Crossotheca from the Rhode Island Carbon- 

 iferous ; by E. M. Round, 131 



Art. XIII. — AFossil Dogwood Flower; by F. H. Knowlton, 136 



Art. XIV. — Intrusive Rocks of the Portsmouth Basin, Maine 



and New Hampshire; by A. Wandke, 139 



Art. XV. — Babingtonite from the Contact Metamorphic 

 Deposits of the Yakuki Mine, Province Iwaki, Japan; 

 by M. Watanabe, 159 



Art. XVI. — ATillite-like Conglomerate in the "Eocambrian" 



Sparagmite of Southern Norway; by O. Holtedahl, . . . 165 



SCIENTIFIC INTELLIGENCE. 

 Obituary.— A. G. Mayor, 173. 



