Miscellaneous Intelligence. 505 



Margarosailite. W. E. Ford and \V. M. Bradley, this Jour- 

 nal, xlii, 159, 1 9 16. — Probably triclinic. In rhombic-shaped 

 cleavage plates, with angles of 102° and 78°. Extinction angles 

 on cleavage plates of 44°, and 54° with the outlines of plates 

 (secondary cleavage directions). Colorless and transparent with 

 a pearly 'luster. II. = 2-5-3. G. = 3-99. Comp.— Pb(Ca, Mil), 

 (SiO,) 3 . Fuses easily and quietly in the reducing flame to an 

 opaque glass. Found at Franklin, N. J. Named from Greek 

 words meaning, pearly and tabular. 



Spencerite. A. II. Phillips, this Journal, xlii, 275, 1916. — 

 In radiating and reticulated crystals. Color white with pearly 

 luster on a good cleavage. G. = 3-12. H. = 2-7. Comp. — 

 Zn 3 (P0 4 ) 2 .Zn(OH) 2 .3H 2 0. Decrepitates in the closed tube, yield- 

 ing water. Found at the Hudson Bay Mine, Sal mo, B. C. 



Slllphatic Cancrillite. E. S. Larsen and George Steiger, 

 this Journal, xlii, 332, 1916. — A cancrinite with nearly one-half 

 the CO„ replaced by S0 4 . Differs from cancrinite by having 

 lower refractive indices and birefringence. a> = T509, e = 1-500. 

 Found in an altered rock (uncompahgrite) on Beaver Creek, a 

 branch of Cebolla Creek, Gunnison Co., Col. 



Ill Miscellaneous Scientific Intelligence. 



1. Centennial Celebration of the United States Coast and 

 Geodetic Survey; E. Lestek Jones. Superintendent. April 5 

 and 6, 1916. Washington, D. C. Pp. 196; 45 figs.— The one 

 hundredth anniversary of the United States Coast Survey was 

 celebrated in Washington on April 5th and 6th. The event was 

 a memorable one and it is well that the occasion should be per- 

 manently commemorated in the present volume. It is remarkable 

 that, so early in the history of this country, those in charge of 

 the Government should have had the foresight to lay the founda- 

 tions for an organization so essential to the welfare of the nation, 

 so useful in its different lines of work, and so broad and thorough 

 in scope. 



There were three public sessions on the days noted, presided 

 over by the Superintendent, also a banquet at which some two 

 hundred and fifty gentlemen were present. The addresses are 

 given in this volume in full, and in addition to those from the 

 President and the Secretary of Commerce, others also of general 

 interest were delivered, notably by members of allied scientific 

 institutions connected with the Government, which have profited 

 by the work of the Survey. An interesting series of portraits of 

 the gentlemen who have served as superintendents, from the time 

 of Dr. Ferdinand Rudolf Hassler in 1816, is likewise included. 



The work which has been and is being accomplished was 

 presented to the eye by the extensive exhibit in the National 

 Museum. This displayed " the various types of instruments used 



