ERRATA. 



Page 97 — note, for bones, read remains. 

 189— line 25, for /. S. read J. L 



184 — line 17 from top, for Medicarninum, read Medicaminum.. 

 do. — ^line 27 from top, for Langrist, read Langrish. 



ALTERATIONS. 



Fage 105 — Title, dele neto before theory. 



108 — ^line 27 from top, after troughs read made. 



112 — line 26 from top, after f^an Marum, read with electrical machines. 



114 — line 7 from top, for about, read between a quarter and, 



143 — line 5 from bottom, dele when the object is of finite magnitude. 



1 44 — line 9 from top, for axis, read axes. 



do. — line 12, from top, {or pencils, read axes. 



