584 Scientific Intelligence. 



second part, which has recently been issued. This deals, as the 

 title suggests, wholly with the effusive rocks, to which over half 

 the work is thus dedicated. An advance over the last edition is 

 to be noted in that age distinctions among these rocks is now 

 done away with and, although the names are still given at each 

 section heading, as basalt, diabase and melaphyre for example, 

 the rocks and component minerals are treated collectively 

 according to the plan followed in the author's Gesteinslehre. A 

 new feature is the erection of the trachydolerite and of the lam- 

 prophyric lavas into independent rock groups. 



This work is so well known and universally used that further 

 comment is unnecessary. The new edition is a practical necessity 

 for every working petrographer. The author is to be congratu- 

 lated upon the completion of a task of such magnitude. 



l. v. F. 



V. Die Fossilen Insehten und die Phylogeyxie der rezenten For- 

 men ; von Anton Handlirsch. Pp. vii-ix, 1281-1430. Leipzig, 

 1908 (Wilhelm Engelmann). — This ninth part completes this very 

 important work, which has been repeatedly noticed in these pages. 

 An exhaustive index fills the closing twenty-seven pages. 



8. Gahnite from Charlemo?it, Mass.; by George M. Flint 

 (communicated). — A new locality for spinel has been added to 

 the list of Massachusetts occurrences of this mineral, by the dis- 

 covery, by the writer, of gahnite, at Charlemont, Franklin Co., in 

 April, 1908. The mineral occurs in complex rocks, of highly 

 raetamorphic character, in the Hawley schist (hornblende-chlorite 

 schist and hornblende-sericite schist) at a point near its contact 

 with the Goshen schist. In this same series of rocks at a distance 

 of about 4^ miles, air-line, the Rowe occurrence of this same 

 mineral* is located. The material collected was taken from the 

 dump of a newly developed pyrite mine about one-quarter of a 

 mile south of the railroad station, and at the foot of the north- 

 easterly slope of Mt. Peak. 



The gahnite is in aggregates of black and greenish black 

 crystals which commonly show a greenish color on fracture; 

 also in the uncommon form of single crystals in quartz ; 

 and more rarely in a chloritic matrix, in which latter case it is 

 associated with tremolite, chloritoid, feldspar, quartz, pyrite and 

 some other minerals. The crystals range from 2 to 12 cm in 

 length and many show the striated faces common in this species. 

 The forms represented are the octahedron, octahedron modified 

 by dodecahedron, and the octahedron twinned in accordance with 

 the usual spinel law. 



9. Hints for Crystal Drawing ; by Margaret Reeks, with 

 Preface by John W. Evans. Pp. xx, 148, with 44 plates. 

 London, 1908 (Longmans, Green and Co.). — This small book 

 gives detailed directions for the plotting of axes and the drawing 

 of crystal figures upon them ; a chapter on the drawing of twins 

 is added. The directions are explicit and the study of the many 



* See A. G. Dana in this Journal, xxix, 455, 1885. 



