11 PREFACE. 



student the useful exercise of constructing formulae. He 

 is at the same time supplied in the Appendix with a com- 

 plete control of his results. This part of the work contains 

 in addition, numerous tables, and other supplementary mat- 

 ter for the use of the more advanced student 



The language of the atomic theory has been rigorously 

 adhered to throughout the work, as the best expression 

 of our present knowledge of the constitution of matter. 

 While it is liable to no objection which does not hold against 

 the language of every department of Physics, its uniform 

 employment has the great advantage of accustoming the mind 

 to a conception which furnishes a probable explanation of the 

 most obscure portions of the science. 



Several topics introduced in the chapters on Physics, are 

 designed simply as introductory to other subjects, and are 

 very briefly treated, in accordance with this design. 



Among the numerous authorities consulted in the prepa- 

 ration of this work, the author would especially mention the 

 works of Berzelius, Liebig, Gmelin, Gregory, Regnault, 

 Payen, Graham, Silliman and Stockhardt. He would also 

 take this opportunity of acknowledging the important aid 

 extended by his able professional assistant, DR. ROBERT A. 

 FISHER, both in the execution of his design for a simplified 

 course of experiment, and for valuable information in rela- 

 tion to several processes of applied chemistry. 



Boxes containing apparatus and materials neatly put up to accom- 

 pany this work, may be ordered of J. R LTJHME, & Co., dealers in 

 Chemical Apparatus and Pure Chemicals, No. 556 Broadway, New 

 York. Price $6.00. 



The list embraces all the articles named on the last page of the work, 

 with the exception of those marked with an asterisk, which may be 

 procured of any druggist. 



