PROCEEDINGS, VOLS. 1-50 MICKOM-MOLLUSKS 



^Micrometer for field-note plotting, 



Micrometers, preliminary study of 

 some modern, 46, 187. 



Microscope, mirror for illuminating 

 opaque objects for the projecting 

 18, 503. 



Microscopical examination of fluids, 

 13. 180. 



of timber, with regard to its 



strength, 21, 2>2>i- 



Migration, industrial, 19, 70. 



Miller, Edward, mushroom rocks, 10, 

 382. 



obituary notice of, 12, 2)-2- 581. 



Miller, G. A., groups generated by 

 two operators each of which trans- 

 forms the square of the other into 

 a power of itself, 49, 238. 



, of orders two and 



four respectiveh' whose commuta- 

 tor is of order two, 46, 146. 



Quaternion Group, 37, 312. 



relations between substitution 



group properties and abstract 

 groups, 49, 307. 



totality of the substitutions on 



II letters which are commutative 

 with every substitution of a given 

 group on same letters, 50, 139. 



transitive substitution groups 



that are simply isomorphic to the 

 symmetric or the alternating group 

 of degree six, 36, 208. 



Millstone Grit in far West, 9, 198. 



Mineralog}-, contributions to, 20, 381 ; 

 23, 30; 24, 23. 



Minerals, classification and nomen- 

 clature of metalline, 25, 170. 



— paragenesis of, in the glaucophane- 

 bearing rocks of California, 45, 

 183. 



Mines, bureau of, 20, 206. 



— explosions in, 10, 338; 19, 405. 



— fish in, 10, 168. 



— silver. Lake Superior, 11, 527. 



]\Iint Cabinet, late additions to the, 



6, 184. 

 [Miocene, Dicotylinae of the John 



Day, of North America, 25, 62. 



— fauna of Oregon, 18, 62,, 370. 



— fossils in San Domingo, 12, 571, 



572. 



— invertebrates from Virginia. 25, 



135- 



[Mirage, lateral and vertical, i, 188. 



[Mirror for opaque objects for the 

 projecting microscope, 18, 503. 



}vlississippi River, North West Ter- 

 ritory and the sources of the, 3, 

 140. 



— — problem, 43, 71. 



]\Iissouri River, geology, &c., of the 



headwaters of the, 7, 10. 

 _ — — and Yellow River, 11, 112. 



— — lignite beds of, 10, 300. 



— Valley, geology of, 10, 292. 

 }klitchel, O. [McK., obituary notice 



of, 9, 147- 



]\Iitcheil, James T., original ms. laws 

 of Province of Pennsylvania in 

 possession of the Society, 36, 176. 



[Mitchell, John K,. obituary notice of, 

 6, 340. 



[Mitchell, S. Weir, obituary notice of 

 Henry Charles Lea, 50, xxxvii. 



[Models, notes on certain, 19, I93- 



[Modification of animal organisms, 

 proofs of the eft'ects of habitual use 

 in, 26, 541. 



[\Iohammedaner. ein guslarenlied der 

 slavischen, 32, 293. 



[Molecular vibrations, vital, 29, 80. 



[Mollusca of the Cretaceous Forma- 

 tion, 8, 57. 



— of the West India Islands, 12, 56. 

 [Molluscan faunule. from the Creta- 

 ceous of [Montana, 42, 188. 



[Mollusks, American fresh water, 5, 



251- 

 — , .muscular fibers in foot of, 



5, 187 



55 



