VI TRANSLATORS PREFACE. 



for the purposes of the present translation, Dr. Hofraeister 

 undertook to combine all the above publications into one 

 uniform whole, revising the text throughout, and adding 

 a quantity of matter existing in manuscript, being the 

 results of his subsequent researches. Dr. Hofmeister's 

 object has been to render his work a complete record of all 

 that is at present known of the subjects to which it relates, 

 and the translator feels confident that this object has been 

 fully attained. 



