Geology and Mineralogy. 335 



from the shove. At Kilauea I found Dana Lake had decreased 

 since last March about one-third, but was active, while fire has 

 appeared to the south but still in the area of depression. Several 

 sharp earthquakes have occurred at Hilo, and one of several dis- 

 tinct shocks was felt by me in northern Hawaii, at Waimea, as a 

 long continuous rumble : at Laupahoehoe on the eastern shore 

 the shocks were more distinct than at Kau in the southern part 

 of the island. The time of transmission from Hilo to Laupahoe- 

 hoe, four miles north, was estimated by telephone at 5". 



(2) Notes from Ernest E. Lyman, on an ascent to the summit 

 of Mt. Boa, in a letter dated Hilo, August 20. — Since Mr. Lyman's 

 former visit to the summit crater in 1888, part of the eastern 

 wall, near "Pendulum Peak," twenty-five yards wide and over a 

 hundred long, had settled thirty feet or more. His descent to 

 the bottom of the crater, on August 7th (Thursday) was here 

 made — the distance down by estimate about four hundred feet. 

 Steam was rising over the bottom from a number of spots not far 

 from the base of the western wall, through the length of the 

 crater, but the amount had diminished greatly since 1888. No 

 other marked changes were observed. Having made his descent 

 to Kau, he learned that on Wednesday night a dozen earthquakes 

 had been felt there, and more severely at Hilo and in Puna, where 

 stone walls were thrown down. At Kilauea three were felt and 

 changes took place in Halemaumau. On the summit, nothing of 

 the earthquake was felt by him, but his guide reported in the 

 morning his hearing " a groaning in the ground." 



Mr. Lyman collected specimens from the layers of lava consti- 

 tuting the walls of the summit crater, which, after being studied, 

 will be reported upon by Professor E. S. Dana, with further cita- 

 tions from his letter. 



6. Brief notices of some recently described minerals. — Neote- 

 site. — A hydrous silicate of manganese and magnesium occurring 

 with tephroite at the manganese mines in Grythyttan parish, 

 Oerebro, Sweden. It is massive, cleavable and resembles red 

 orthoclase. Hardness=5-5-5. An analysis gave: 



Si0 2 29-50 MnO 40-60 Mg 20*05 FeO tr. H 2 9-85 = 100 



The general formula is R Si0 4 + H 0, or a hydrated tephroite. 

 — L. J. Igelstrom in Jahrb". Min., i, 257, 1890. 



Cipltte. — A supposed silico-phosphate of calcium occurring in 

 the chalk at Ciply, and elsewhere in Belgium, associated with 

 phosphorite. It has not been fully described. — J. Ortlier, ref. in 

 Bull. Soc. Min., xiii, 160, 1890. 



Pholidolite (Folidolit). — A mineral allied to the chlorites, 

 from Taberg in Wermland, Sweden. Occurs in small tabular 

 twinned crystals of a grayish yellow color and pearly luster. 

 Specific gravity 2*408. An analysis gave: 



Si0 2 



A1 2 3 



MgO 



FeO 



MnO 



K 2 . 



H 2 



49-78 



6-31 



27-94 



4-08 



012 



5-93 



5-49 = 99-65, 



