402 INDEX. 
Plou h, American, 1 190 
Poms 
Potatoes, opal of in steam engine hotlors 193° 
Precession of the bay remarks on, 328 
Primitive forms of crystals, connexion not wie the number of 
‘scmunas axes of double refraction, 363 os 
designe: new method of, 191 . 
Maris aon on, 63 
Prowall n Travellers, 1 
Pooudomsdrpleaa granite, 22 , 
Public Education, notice of a new work on, 161 
Instruction, method of J. ‘Ondinair, 199,.383 
Pyro-citric acid, 187 , 
Pyrotechny, title of 
Pyroxene of Sparta, N. h es of, 145 
Q. if , cf iv? 
ae ay 
Quartz smoky , 48—grey, i3—milky, 48 
Guinby AS Be on Crank motion, 316 ss 
Rain-gage, description of an improved, 426 * 
Rapids, navigation of, 176. — ff 
Rhubarb, Sulphate of, 385 
ock formations of the C ticut, Tabular arrangement of, 24 
Rocks accompanying Anthracite, remarks son, 2 
ks on the systematic arrangement of, 26) 
Rocking stone, Roxbury, Mass. 59 
k, 
——-, Warwick, R.1, 201 __, ie 
Rocking stones, 157 ; 7 
Roxbury Rocking stone, 69° 
2 S. 4 : 
» Salt, oy on, 360 
Bae ed by mechanism, 198 
olite, 
Scenery of the Sasa 5 1 sapien Bis 
Scented fires, 1 
Schoolcraft H. Re on the e cqEP SE of lake saben? 43 i 
—_—_————— locali es of minerals, 4 We vn , 
Schweinfurt green ‘386 
