E. MINERALOGY AND GEOLOGY. 233 



Several months were spent in 1869 in the investigation, 

 the results of which have just been published by the society 

 in a pamphlet of forty-four pages. The topography, the pe- 

 culiar features of Attacapas and other prairies, the Calcasieu 

 Prairie, Lake Charles, Sabine Parish, the Red River, and other 

 important regions in the state, are all passed in review, and 

 much information of especial value is presented. 



Professor Hilgard states in general terms, as the result of 

 his researches, that the geological formation of Louisiana ly- 

 ing west of the main axis of the Mississippi Valley is more 

 or less accurately the reflected image of that of the states of 

 Mississippi and Alabama east of the same. 



DE. HAYDEN'S BULLETIN. 



Dr. Hayden, the head of the Geological and Geographical 

 Survey of the Territories, has commenced the publication of 

 a bulletin to communicate such announcements of new facts 

 made by any member of his party as it is desirable to bring 

 promptly to the notice of the scientific community in advance 

 of their publication in his reports. The first number of this 

 bulletin, bearing date January 21, is occupied by a list of the 

 members and collaborators of the survey for 1873, and a list 

 of the publications, from which we learn that six volumes of 

 the reports have appeared from 1867 to 1873, and that seven 

 volumes of miscellaneous publications will be published in 

 octavo form, the most elaborate being the hand-book of the 

 ornithology of the Northwestern Territories, by Dr. Cones; 

 several quarto volumes will also be sent out, of which there 

 have been actually published one by Professor Leidy, on the 

 extinct vertebrata of the Western formations, and one on the 

 Acridida3 of North America by Professor Cyrus Thomas. 

 This quarto series, it is expected, will include ten volumes, 

 among them memoirs on the vertebrata of the cretaceous 

 and tertiary formations, by Professor Cope ; one each, on the 

 fossil plants, by Professor Newberry and Professor Lesque- 

 reux ; on the fossil invertebrates, by Professor Meek ; and 

 the volume on general geology, by Professor Hayden. 



Thirteen maps have been published for the survey, those 

 of the Yellowstone region being especially valuable. The 

 body of the bulletin is occupied by a report on the strati- 

 graphy and pliocene vertebrate paleontology of Northern 



