80 Scientific Intelligence. 
8. Geological Survey of Alabama: Report of progress for 
1879 and 1880; by Everne A. Smirn, Ph.D., State Geologist ; 
5 ., 8vo.—This report contains a detailed description of the 
coal-measures of the Warrior Coal Field, and is accompanied by 
a geological map of the region. 
. The Felsites and their associated rocks north of Boston; by 
J. 8. Duter. Bulletin of the Museum of Comparative Zoology 
at Harvard College, vol. vii, (Geological Series, vol. i, pp. 165 to 
180, 8vo).—Prof. Diller treats of the physical and other char- 
acters of the felsitic rocks, including felsites.and conglomerates, 
of Medford, Malden, Melrose, Wakefield, Saugus and Lynn, in 
Eastern Massachusetts, and of some of the adjoining rocks. ‘ He 
arrives at the conclusion that the felsites are eruptive rocks. 
He gives for the order of age for the rocks referred to as erup- 
ive: granite, felsyte, dioryte, and diabase and melaphyre. 
10. Mémoire sur les Phénoménes d’ Altération des Dépots super- 
ficiels par Vinfiltration des eaux Météoriques, étudiés dans leurs 
rapports avee la Géologie stratigraphique, par Ernest VAN DEN 
Rc@ecK, Conservateur au Musée Royale d’Histoire Naturelle, At- 
taché au service de la Carte Géologique. 180 pp. 4to, with a 
folded plate. Bruxelles, 1881. From vol. xlivy of Mém, Couron- 
disturbance. In other cases gray beds are overlaid by yellow 
beds or gray clays by yellow clay deposits; and as before, the 
of Quaternary deposits, fully sustaining his conclusions. : 
11. On the application of a solution of mercuric potassium 
GoLpscHMIDt. ingenious meth r separating mechan- 
ically the mineral constituents of a rock, propose . Thoulet, 
has already been extensively employed by lithologists. | This 
suric 1 
