

Astronomy, Geology, and Meteorology, — Orreries, Telluri- 

 ans, Globes 18, 12, 10, and 6 inches diameter, Clinometers for tak- 

 ing the inclination and direction of strata, Reflecting Goniometer, 

 Rain Gauges, Barometers and Thermometers. 



Electro-Magnetism. — A very great variety of Apparatus and 

 Machines for Motion, Shocks, and Sparks, for illustrating this inter- 

 esting branch of science. 



Galvanism. — Batteries, improved construction of different sizes. 



J. M. W. would refer to his Catalogue for further information, 

 copies of which will be sent per mail on application. All letters 

 post paid. 



Sets of Apparatus for the various departments of science, are put 

 up for Schools, Academies, Colleges, &c. at all prices. Respecting 

 the quality of the apparatus manufactured by J. M. W., he has the 

 pleasure of referring to the Editors of the f Journal of Science, and 

 also to the following awards from the Fairs of the Mass. Char. 

 Mech. Association held in Boston. Silver Medal, 1837. GOLD 

 MEDAL, 1841. Silver Medal, 1839. 



Boston, Dec. ], 1841. 



MURCHISON'S SILURIAN SYSTEM. 



Messrs. WILEY & PUTNAM beg leave to inform American 

 Naturalists that Mr. Murchison has made such arrangements with 

 their London house, that they can now offer his splendid and im- 

 portant work on the " Silurian System," 2 volumes quarto, with 

 many plates and separate maps, large, minute, accurate, and beau- 

 tiful, and with numerous designs in the text, for the low price of £5 

 sterling, with only the cost of importation and duty added. The 

 work was published at £8, and the price has not been and will not 

 be lowered in England. Orders should be addressed to Wiley & 

 Putnam, 161 Broadway, New York. 



December 23, 1842. 



MISS AGNES MITCHELL 



% 



ARTIST 



Begs leave to give notice, that she will he happy tofu 

 nish Illustrations for Works on Natural History 



Miss A. M. has had much practice in making Drawings of sub- 



jects in Botany, Conchology, &.c. and holds recommendations from 

 Naturalists of high reputation in this country and in Europe. 



Miss Mitchell likewise gives Instructions in Drawing and Painting. 



Apply to Messrs. Wiley & Putnam, or at Miss Mitchell's resi- 

 dence, 104 Hicks Street, Brooklyn. 



Brooklyn, L. I., Sept. 1842. 



