PREFACE. vii. 



qudinted with the original, from having been en- 

 gaged in abridging it for a work of his own : 

 Jfr. ALLEN'S familiarity with every department 

 of Chemistry, rendered him particularly well 

 qualified for the appreciating the accuracy of 

 chemical language; and the Translator takes 

 this opportunity of expressing to both these Gen- 

 tlemen his most sincere thanks, for their very va- 

 luable corrections. 



