ERRATA. 



Page 16. line 3. for Young's read Young. 



P. 21. 1. 26. This series is the same as the last, the higher powers of a 



beinsr neglected. 



P. 22. 1. 7. for ?/ read ?/ ( equation of the centre.) 

 P. 55. I. 5. for A 4- S As -4- B -f S B* H- C 4- S C -}- c. read A X S A* 



4- B X S Ba + C X S Ca -j- c. 

 P. S'l. 1. 3. for spheriod read spheroid. 

 P. 88. 1. 1(>. for with read of. 



P. 107. March 7, re-id J 1. 1 1 ; April 1 1, read 0. 14 j June 13, read 0. 2L 

 P. 147. In some copies the Ficrure has been inverted by mistake. 

 P. 163. 1. 20. for .43424948 read .434^9443. 

 P. 175. I. 21. for mix. read rnin. 



P. 25:?. 1. 26. for 2 g x W * W r ; read 2 g X W s = W c. 

 P. 273. 1. 11. for Berege read Barege. 

 P. 302. Art. Thermometer, for Centrigrade read Centigrade. 



Durham ; Printed by Francis HwnMe. 



