Advertising Sheet of the 



GEOIiOG-ZCAIi 



DRAWINGS AND ILLUSTRATIONS. 



Mr. ROBERT BAKEWELL, 



Would inform Professors of Colleges, Principals of Academies, 

 Lyceums, and other Literary Institutions, that he keeps on hand 

 Drawings and Diagrams on paper and on canvass, (in distemper,) 

 illustrative of the ncience of Geology, comprising Stratification, Me- 

 tallic Veins, Organic Remains, Active and Extinct Volcanoes, Sec. 



The Drawings are fixed on Rollers, adapted for Lectures. Let- 

 ters addressed to R. Bakewell, Instructor of Drawing and Perspec- 

 tive in Yale College, at Mr. Ebenezer Johnson's, 47 Chapel street, 

 New Haven, will be duly attended to. 



Drawings and Plans of every description copied with dispatch. 



New Haven, January, 1845. 



Mr. Bakewell's Drawings are excellent. — Eds. Am. Jour. Sci. 



Dr. J. R. CHILTON, 



PRACTICAL CHEMIST, he, 



No. 263 Broadway, New York, 



Keeps constantly for sale at his establishment, a general assort- 

 ment of Philosophical and Chemical Apparatus, Chemical Prepara- 

 tions, and every thing necessary for the study of Chemistry and 

 other branches of Natural Philosophy — among which are the fol- 

 lowing : 



Pixii's French Air-pumps, with glass barrels ; other air- 

 pumps with brass barrels, single and double, of various sizes, to- 

 gether with the various apparatus used with them. 



Large and small Plate Electrical Machines, Cylinder 

 Electrical Machines, and a variety of Electrical Apparatus. 



Electro-Magnets, mounted on frames, of various sizes, capa- 

 ble of supporting from 20 to 3000 lbs. j 



Page's Compound Magnet and Electrotome, for producing 

 brilliant sparks and powerful shocks. The same instrument, with a 

 contrivance attached by which the intensity of the shocks can be 

 modified at pleasure, which renders it one of the most convenient 

 instruments for the application of electricity as a remedial agent in 

 the cure of disease, and for physiological experiments. 



Small working models of Electro-Magnetic Machines, of 

 different kinds, and a great variety of Electro-Magnetic Instru- 

 ments for the purpose of illustrating the theory of Electro-Mag- 

 netism. 



