398 Scientific Intelligence. 



book. They furnish a definite idea of the morphology of these 

 animals, however much of this idea may have been contributed by 

 the author. h. s. w. 



6. Contributions to Mineralogy and Petrography from the 

 Laboratories of the Sheffield Scientific School of Yale Uni- 

 versity ; edited by S. L. Penfield and L. V. Pirsson. Pp. 482, 

 8vo. New York, 1901 (Charles Scribner's Sons). — This volume 

 forms one of the series of Yale Bicentennial publications men- 

 tioned in the last number (p. 321). It is devoted to the min- 

 eralogical and petrographical work of the University. Part I, 

 edited by Professor Penfield, opens with an interesting summary 

 of the development of mineralogy at New Haven from the 

 appointment of Professor Benjamin Silliman in 1802 to the 

 present time; the record of work accomplished and of the influence 

 thus exerted on the progress of the science in the world is a 

 remarkable one. A bibliography follows including some two 

 hundred and twenty-five titles of papers and books published 

 since 1849. A list is also given of the new. species described^ 

 thirty-six in number, and of species whose chemical composition 

 or crystallization has been established. The bulk of the volume, 

 pp. 30-377, is given to selected papers reprinted largely from the 

 pages of this Journal. The first of these is the one by Prof. 

 G. J. Brush on American Spodumene ; among others are the 

 Branchville papers by Brush and Dana, and numerous important 

 researches chiefly by Penfield and his students. 



Following the mineralogical part of the volume is Part II, 

 pp. 381-480, devoted to petrography. This includes a brief 

 history of the department and nine reprinted papers ; this por- 

 tion of the volume has been edited by Professor L. V. Pirsson. 



7. On a large Phlogopite Crystal y by W. Harvey McNairn. 

 (Communicated.) — A crystal of phlogopite, of unusual and proba- 

 bly unexampled size, was discovered in a mica mine near Syden- 

 ham, Frontenac Co., Ontario, at a depth of about 30 m . The 

 vein, which occurs in pyroxenite, is about 10 m wide and consists 

 of mica imbedded in pyroxene. Next to the hanging wall there 

 is a layer of calcite enclosing and occasionally replaced by 

 apatite. On the other side there occurs a dark green, cleavable 

 pyroxene which gradually changes into the pyroxenite. The 

 crystal traversed the vein from S.W. to N.E. in an approx- 

 imately horizontal direction. It was a clear, dark colored, amber 

 phlogopite of an excellent quality for electrical purposes. The 

 outline of the cross-section was roughly hexagonal and it had the 

 spindle shape frequently observed in elongated crystals of the 

 micas. At the point measured, which was slightly past the 

 greatest diameter, the cleavage face was l*5 m x 2 m , and at that 

 time about 5 m of the total length had been removed. As far as 

 one could tell there w r as a considerable amount still left in the 

 matrix. Sheets of the full size, however, were not available as 

 the crystal was divided longitudinally by a parting which joined 

 two diagonally opposite corners. 



University of Toronto. 



