CALIFORNIA ACADEMY OF SCIENCES. 57 



the bright equatorial belt. It revealed itself only upon 

 short occasions of extreme quietness of the atmosphere. 



For ail these studies I have used eye-pieces of various 

 characters, with magnifying powers from 120 to 500 diam- 

 eters, but only upon one or two occasions utilizing the lat- 

 ter. 



Jupiter. Numerous drawings of the beltings of Jupiter 

 have been made with observations upon the satellites. The 

 power used ranged from 120 to 300 diameters. A later re- 

 port will be made upon this planet. 



Mars. The observations have not been so satisfactory on 

 this planet. It has happened that I have not had one op- 

 portunity when the atmosphere was quiet; but drawings have 

 been made with powers reaching 300 diameters. 



C0LEMANITE. 



BY J. T. EVANS, A. M. 



A new mineral called " Colemanite" was found not long 



since in the southern part of this State, and named in honor 



of "William T. Coleman, of this city. It is a hydrous borate 



of lime. There are several minerals of somewhat similar 



composition, and its affinities are shown in the following 



schedule : 



f 2CaO 15.9 



Ulexite J Ja 2 8.8 



{ 5B„ O s 49.7 



L 10Aq 25.6 



( CaO 20 89 



Bechilite * ) 2B„ 3 52.24 



( 4Aq 26.87 



( 2CaO 27.18 



Colemanite ) 3B„ 3 50.98 



( 5Aq 21.84 



( 2CaO 29.78 



Pandermite J 3B 2 O, 55.8i 



o 



( 3Aq 14.36 



( 3CaO 29.9 



Pnceite 1 4B„ 3 49.8 



( 6Aq 20.3 

 5 



