ERRATA. 
Page 52, line 26, dele practically. 
Page 61, line 5, for in general is, read is general, being. 
Page 65, line 8, for point X, read horizontal line drawn through the point X pa- 
rallel to the axis of motion. 
Page 77> lines 1 and 9,/or WGS, read UGS; and line 24, for WGO, readGGO. 
Page 78, line 2, for VW, read VU. 
Page 85, line 26, for B, read R. 
Page 91, last line, for QA, read NF. 
Page 96, last line, for prop. iii. read prop. ii. 
Page 97, line 18, for GZ, read rZ. 
Page 100, line 12, for horizontal line, read indefinite horizontal line. 
Page 107, line 3 and 4, dele HD n HA. 
Page 1 15, line 5, for AB — PX, read WP — PX, fig. 1 1. and 28. 
Page 124, line 11, for is, read are. 
Note to be added to page 104, last line, to the word “ inquiry.” 
The following remark on the propositions and demonstrations of Apollonius 
Pe rg;eus, equally, or rather more applicable to those of Archimedes, is extracted 
from Dr. Wallis’s Algebra. 
“ Et quidem merito censeri posset ille, magnus geometra, et prodigiosae, turn phan- 
“ tasias turn memoriae vir, si possibile putemus ut potuerit ille propositiones et demon- 
“ strationes perplexas, eo ordine quo ad nos perveniunt invenire, absque cujusmodi 
“ aliqua inveniendi arte qualis est quam nos algebram dicimus.” 
Dr. Wallis’s Algebra, cap. LXXVI. 
Page 124, line 26, note to the words “ first applied.” 
Pere Pardies and Chevalier Renaud published some partial observations on the 
theory of naval architecture rather before this period : but the treatise of M. L’Hoste 
seems to be the first work in which this subject is considered systematically, and at 
length. 
Page 127, line 8, for whatever may have been, read whatever may be. 
Page 135, line 7, insert the Rev. before Nevil. 
Page 202, lines 28, 30, and 31 ,for w 1 , w z , w 3 , read <* 3 . 
Page 205, line 27 , for w, read a. 
