vi 
PEEPACE, 
remainder that of Sillig (Grotha, 1851-3), excepting in some 
few instances, where, for reasons given in the Notes, it 
has been deemed advisable to depart from it. The first 
two Books, and portions of others, are the performance of 
the late Dr. Bostock, who contemplated a translation of 
the entire work; but, unfortunately for the interests of 
science, he was not permitted to carry his design into 
execution. 
Upwards of a hundred pages had been printed off before 
the present Translator entered on his duties ; and as they 
had not the advantage of Dr. Bostock' s superintendence 
through the press, some trifling oversights have occurred. 
These are, for the most part, corrected in a short Appendix. 
V 
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