PREFACE. 
more valuable matter, relating to the corrections 
of unavoidable errors concerning the old species. 
For, itis far less easy to unlearn, than it is to ac- 
quire new information: and because unaltered and 
| SUM Pa! i * 15^m 
y the 
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solar disk, diaite the brightness of our ever- 
pleasing science, — 
** Nitorem scientize polluunt,"" 
SEC CEE CIE ur 
