Geology and Mineralogy. 71 



3. Atlas von China : Orographische und Geologische ITarten; 

 von Ferdinand Freiherr von Richthofen ; zu des Verfasser's 

 "VVerk, China. Erste Abtkeilung; das Nordliche China. — This 

 large atlas to the second volume of Baron Richthofen's great 

 work on China contains a duplicate series of colored charts rep- 

 resenting, in different colors and on a scale of 1 : 750,000, the 

 orographic features and geological structure of Northern China. 

 Twelve regions, each about 130 by 170 geographical miles in 

 area, are thus illustrated — five of them about the Yellow Sea ; 

 one, that of Pekin, just west ; and six to the west, south, and 

 southwest of Pekin. The coloring of the charts is in the best 

 style of Vienna artists; 15 to 20 shades are used on the several 

 charts. By the different colors are exhibited the areas of the 

 immense alluvial plains of the Hoang-ho about the Yellow Sea ; 

 of the marine loess; of the loess of the interior regions ; of the 

 gneiss ; of other metamorphic rocks ; eruptive granite ; Low el- 

 and Upper Cambrian (Sinian) ; Silurian with Devonian ; Carbon- 

 iferous limestone ; Productive Carboniferous ; Trias ; Jurassic ; 

 porphyry ; tr-achyte and basic eruptives. Cambrian schists have 

 a wide distribution, covering over a thousand of square miles 

 (geographical), and near Pekin they are strongly metamorphic. 

 Silurian and Devonian beds, and also Carboniferous and Permian 

 occur to the southwest of Pekin in Tsing-ling-shan and the dis- 

 trict next east. The Carboniferous beds, which are the highest 

 formation over much of the interior, also exist in the hilly parts 

 of the districts near the Yellow Sea. The work is a large contri- 

 bution to the Systematic Geology of Northern China. 



4. Swedish Geological Survey. — The Geological maps of the 

 Swedish Geological Survey now issued number 96, and extend 

 over about half the surface of the country. They are models of 

 beautiful coloring, and careful details. The larger part are on a 

 scale of 1 : 50,000 ; a few on that of 1 : 200,000. The price 

 charged for the sheets is 1*50 kr. each. Besides these there are 

 four general charts (one of these glacial) and three special. The 

 publications of the survey thus far issued include also 77 memoirs 

 in 8vo, and 4to, by the geologists of the survey, A. Erclmann, E. 

 Erclmann, A. Bortzell, A. E. Tornebohm, O. Gumselius, D. Hum- 

 mel, J. G. O. Linnarsson, H. Santesson, O. Torell, A. G. Nathorst, 

 E. Svedmark, A. Blomberg, S. L. Torquist, S. A. Tulleberg, F. 

 Svenonius, B. Lundgren, F. Eichstadt, G. DeGeer, M. Stolpe, J. 

 C. Moberg. 



5. The earliest {Devonian) winged Insects of America. (8 pp., 

 with one plate. Cambridge, Mass.) — Mr. S. H. Scudder, in this 

 paper, reviews the facts with regard to the five earliest of Ameri- 

 can winged Insects, and concludes that the genus Gerephemera 

 belongs to the group of Protophasmidse, one, Platephemera, to 

 the Ephemeridse, and three, Homothetus, Lithentomum, and Xeno- 

 neura, to as many distinct families of ancient Neuroptera. He 

 repeats a former conclusion that in the historic dev elopement of 

 the broader group of insects, so far as we now are acquainted 



