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SCIENTIFIC DEPARTMENT. 



The pictures in the following Scientific Sets are photographs beautifully colored, except 

 in such individual cases as do not admit of color. 



When these are sealed in Canada Balsam, with carefully finished sky and background, 

 they are sold at $2.50 each. Considering, however, that for educational uses, there is 

 little need for this extra finish, and that their demand for school purposes is likely to be 

 large, the choicest of them have been selected to be sold in sets at an average of $1 50 

 each. When not taken in sets, they are $2.00 each ; when sealed, as above indicated, they 

 are $2.50 each. 



These Scientific Slides are just suited to the wants of Educationalists at this time. They 

 need but to be known to be very highly appreciated. These, with the Sciopticon, are far 

 more useful than huge piles of cumbersome philosophical apparatus of many times the cost. 



