



2 Advertising Sheet of the 



ILLUSTRATIONS FOR LECTURES 



ON 



VARIOUS BRANCHES OF NATURAL SCIENCE, 



. Painted in Distemper by 

 RUSSELL SMITH, 



Landscape Painter, Milestown, Philadelphia Coun- 

 ty, Penn. $ 





Letters to be addressed to the care of Professor John F. Frazer, 

 Philadelphia. 



July, 1844. 



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 : 



Pixn'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 ^variety of Electrical Apparatus. 



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

 ble of supporting from 20 to 3000 lbs* 



Page's Compound Magnet and Electrotome, for producin 

 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 m 

 the cure of disease, and for physiological experiments. J 



Small working models of Electro-Magnetic Machines, o 

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

 ments for the purpose of illustrating the theory of Electro-31ag- 

 netism. 



"5 



