338 



INDEX. 



Plants, desirable for ornament, 322 



introduced, , 319 



noxious, 319 



noticed, on Stone I., 323 



on Dr ummond's I. , 328 



Plaster. See " Gypsum." 



Plaster Bluff, 93, 95, 96 



Plaster Pt., "Sinkholes" at, 95 



Pleurotomaria, 85 



subconica, 52 



Plumb Creek Quarries, 59, 67 



Plutonic Group of Rocks in Mich. , 47 



Plymouth, Wayne Co. , 132 



Polypora, 105 



Polypiforous Portion of Upper Limerock,. 15 



Poplar trees, 295 



Porcupine Mts. , 48 



Portage Group, 79 



characters of, in Mich. , 135 



Portage Lake, L. S. , , 48 



Port Austin, 81 



Port Huron, St. Clair Co., 199 



Post, Henry D. , aid received from, 32, 84 



Potawotomie Is. , 57 



Potter, Dr. H. C. , connection of, with salt 



manufacture at East Saginaw, 25 



aid received from, 32, 172 



Powers and Martin's Salt Well, 93 



statistics of, 147 



phenomena of,. . , 168 



Presqu' Isle, L. S., 47 



Primary Rocks, 15 



Prodnctus, 65,102,106,107 



Altonensis, 105 



pileiformis, 106 



Wilberanus, 106 



asperus, 119 



ProetuSy 64 



Professors, self-styled, cautions against,. 35 

 Prout, Dr. H. A. , investigation*of Bryozoa 



by, 31 



PL auChene, (Little,) 57,59,61 



Pt. aux Barques, 73, 81 



Pt. aux Peaux, 62, 64,66,127 



Pt. Detour, 57 



PtilMyctia, 105 



Pulaski, Jackson Co. , , 84 



Pyrites, 72, 74,75, 115,120,122 



Q. 



Quicklime, manufacture of, in Monroe Co., 67 

 R. 



Railroad passes acknowledged, 34 



Raisinville Quarries, 59, 63, 66, 67 



Sulphur Springs near, 205 



Raspberry Jam, 261 



Receptaculites, 52 



Reports of Dr. Houghton and his Assist- 

 ants, 7 



influence of, 12 



of Wm. A. Burt and Bela Hubbard,.. 11 

 of Dr. C. T. Jackson and Foster and 



Whitney, 15 



Rhomb Spar, 66 



Rhynchonella, 75, 80, 82 



plena, 52 



aUilis, . 52 



n. sp., ., 64 



Ridges of the earth's crust, how devel- 

 oped, 42 



distribution of, 44 



Roberts, C, quarry of, 99 



» Robinson's Folly," Mackinac Island,.... 61 



Rock Bar, Shiawassee Co., 122 



Rocks, general classification of, ia Mich.,. 47 

 , ... ^detailed table of, .138 



PAOB. 



Roscommon Co. , 97 



Round L, 58,61 



S. 



Sager,Prof. Abrarn, former State Zoolo- 

 gist, 7 



Saginaw Co. , 114 



Saginaw R. , Zoological collections from, . . 23 



Sailor Encampment I. , 50, 53 



Saline, Washtenaw Co. , 97 



Salomet9r, 179 



Salt, perhaps discoverable in the Ononda- 

 ga Salt Group of Michigan , 59,177 



practical and commercial statements 



relative to, 165 



hints on the search for, 130, 165 



operations for, at Grand Rapi;is,.166, 174 



at East Saginaw ,....., 170 



at other points in Michigan, 173 



manufacture of, at Grand Rapids, . . . 169 



at East Saginaw, 172,174 



at Onondaga, N . Y. , 190 



in England and on the continent,. 191 

 purity and excellence of, in Mich.,. ..173 



cost of manufacturing, 175 



consumption of, 178, 189 



general and comparative statements 



relative to, 178 



amount of, manufactured in N. T.,..188 



in the United States, 189 



receipts and shipments of, 189 



uses of, 192 



Salt Bounty and other legislative encour- 

 agements, 176 



Salt Group of rocks. See " Michigan Salt 

 Group." 



Sand Bay, L. S. , 48 



Sand Cherry, 259 



Sand Creek, Ottawa Co. , 84 



Sandstone, Jackson Co., 98,112 



Sandstone, Red, and Shales, 15 



Sandstone of L. Superior, 48 



Sanilac Co. , 73, 82 



Schizocrinus, 52 



Schoolcraft, H. R. , explorations of, 6 



Scipio, Hillsdale Co. , 84 



Scribner, Jas., connection of, with the salt 

 manufacture at Grand Rapids,. 24, 167, 169 



Scribner's Salt Well, 90, 93, 102 



statistics of, 146 



manufacture of salt at, 169 



Seaman's Quarry, Drummond's I. , 55 



Sebewaing, Tuscola Co. , 100 



Shattuck, G. M., fossil remains discovered 



by, 182 



Shiawassee Co. , 114 



Shoemaker, Michael, quarry of, 98 



Siyillaria, . . 114 



Silliman & Walker, coal explorations of,.. 123 



Silurian System, Lower, 49 



Upper, 54 



" Sink holes," at Plaster Pt. , 95 



Sitting Rabbit, L. Mich., 58 



Six Mile Creek, Shiawassee Co., 123 



Smith, W. P., former Assistant Zoologist,. 7 



Solen, 77, 80, 85 



Specific Gravity, 178 



Specimens, unpacking of, labeling, &c.,.. 29 



quantity of, 29 



where to be distributed, 36 



Spirifer gregarius, 65 



acuminatus, 65 



duodenarius, , 65 



mucronatus, t 70 



Keokuk, var., 109 



oameratus, 119 



