82 Scientific Intelligence. 



Agriculture, plates 1-62, figures 1-7, map, pp. 4-354, 1899. 

 (Geological Survey of Louisiana, Wm. C. Stubbs, Director.) 

 The author recognizes in Section II the following formations : 



Cretaceous series — Ripley stage. 



Eocene series — Midway, Lignitic, Lower Clarborne, and Jack- 

 son stages. 



Oligocene — Vicksburg and Grand Gulf. 



Lafayette — 



Quaternary — (including the Columbia of McGee and Biloxi 

 sands of Johnson) Basal gravel, Port Hudson, Loess and Yellow 

 Loam, Alluvium and recent coastal formations. 



In Section III — special reports — nine miscellaneous reports are 

 given by various authors, the last on " Wood-destroying Fungi," 

 by Professor Atkinson. 



4. Geology of Panama. — In a study of the geology of the 

 isthmus of Panama recently published by Messrs. Bebtband and 

 Zurchee.* Bertrand draws the following important conclusions 

 regarding the probability of earthquake shocks in the Panama 

 region : 



" There are no volcanoes near Panama, all eruptions having 

 ceased since the Miocene; this is the first and most important 

 point of all. 



Since the earthquake of 1621, which is in reality disputed, 

 there have been in the region only very feeble shocks, a part of 

 which were due to the echo of far distant earthquakes. 



The depression made use of by the Panama canal project is not 

 a transverse fracture. 



The sinking of the Pacific coast, and especially the subsidence 

 of the bay of Panama, of which there are numerous indications, 

 are not phenomena now going on but finished, so far at least as 

 regards the present geological epoch. There is there no special 

 reason for crustal movement. 



Finally, the plan of the lines of folding and the distribution of 

 volcanic and seismic activity following these lines, shows that 

 Panama is situated in a sort of dead angle, in a tranquil zone, at 

 an equal distance north and south from the lines of disturbance. 



Thus all considerations, whether statistic, volcanic or seismic, 

 lead to the same conclusion, that Panama is the most stable and 

 least menaced region of Central America." l. v. p. 



5. Enrichment of Mineral of Veins by later Metallic Sulphides ; 

 by Waltee Harvey Weed. Bulletin of the Geological Society 

 of America, vol. n, pp. 179-206. — Secondary sulphide enrichment 

 is certainly one of the most interesting subjects of economic geol- 

 ogy, and, as noted by Mr. Weed in the opening pages of his 

 article, is one upon which surprisingly little has been written, 

 considering its scientific and practical importance. Among prom- 

 inent writers on ore deposits, De Launay, Posepny, Emmons and 



* Etudes geologiques sur Visthme Panama and Phenomenes volcaniques et les 

 tremblements de terre de FAmerique Centrale. Paris, 1900. 



