Geology and Mineralogy . 325 



Ekdeiolite is related to the preceding species and like it 

 occurs in regular octahedrons, at first taken for pyrochlore. 

 Color dark chocolate-brown; hardness 5, sp. gravity 3*44. An 

 analysis (Mauzelius) gave (assuming the loss to be Si0 2 ) : Nb.,0 5 

 59-93, Si0 2 [1T48], Ti0 2 0-76, Zr0 2 3-78, Ce 2 3 4-43, Fe 2 O s 2-81, 

 MnO 0-37, CaO 7-89, K 2 0-43, Na 2 3-58, H 2 4-14, F0"69=' 

 100-29 (deduct O) = 100. The formula deduced is RNb 2 6 (HO) 2 

 + RSi0 3 . 



Part II (pp. 181-213) contains descriptions of minerals from 

 the nephelite-syenite of Julianehaab, by O. B. Boeggild and Chr. 

 Winther. Three new species are included here and also an 

 account of steenstrupite. 



Epistolite is a silver-white mineral described by Boeggild. 

 It resembles brucite in its tabular crystals and pearly luster on 

 the basal cleavage ; it is, however, monoclinic in crystallization. 

 Color white; hardness 1 to 1-5 ; sp. gravity 2*885. An analysis 

 (Christensen) gave: Si0 2 27-59, Nb 2 5 33-56, Ti0 2 7"22, FeO 

 0-20, MnO 0-30, CaO 0-77, MgO 0-13, Na a O 17-59, H 2 11-01, 

 F 1-98 = 100-35 (deduct O) = 99-52. No definite formula can be 

 obtained, as the material used was somewhat altered. 



Britholite, described by Winther, occurs in pseudo-hexagonal 

 crystals, related in composite form to aragonite. Color brown, 

 opaque; luster greasy to vitreous; hardness 5-5; sp. gravity 

 4-446. An analysis (Christensen) or av e: SiO„ 16-77, P 2 6 6-48 

 (Ce,La,Di) 2 3 60-54, Fe 2 3 0-43, CaO 11-28," MgO 0-13, Na 2 

 1-85, H 2 1-27, F 1-33 = 100-08. 



Schizolite, also described by Winther, is characterized as a man- 

 ganese pectolite. It occurs in columnar masses and prismatic crys- 

 tals, elongated parallel the «5-axis ; cleavage parallel to two faces 

 in this zone. Color pink to brown ; hardness 5 to 5-5 ; sp. gravity 

 3-089. An analysis (Christensen) gave: Si0 2 51*06, TiO„ 0*68, 



Ce n 3 1-47, FeO 2-79, MnO 12-90, CaO 19-48, Na 2 10-71, H 2 



i 

 1-36 = 100-45. The formula deduced is 4R 2 O.10RO.15SiO 2 , 

 which does not agree very closely with that of pectolite. 



Obituary. 



James Edward Keeler. The Director of the Lick Observa- 

 tory, Professor James E. Keeler, died at San Francisco after a 

 brief illness on August 12th. Few of his friends had a suspicion 

 that his health was otherwise than in the excellent condition 

 which was believed characteristic, until the widely published 

 announcement of his death met their eyes. 



James Edward Keeler, born at La Salle, Illinois, on September 

 8th, 1857, where he also received his early schooling, doubtless 

 owed much of his intellectual alertness to his father whose career 

 had been singularly varied and interesting. A paymaster in the 

 navy during the civil war. his intimate connection with the moni- 

 tor class of ironclads, including a participation in the famous 

 fight between the Monitor and the Merrimac and subsequent 



