414 Mr DAVIES on the Equations of Loci 



P. 291, Eq. 16. In the numerators,/or 2E* D 2 and 2D 2 E* read 



2 (E 2 D 2 ) 2 and 2 (D 2 E 2 ) 2 

 In the second equation, for sin read cos 

 In the denominator, for E 1 read E 2 



292, 1. 1, for (4.) from (3.) read (4.) from (2.) 



293, In equation (14.), coefficient of sin (f>, for sin a sin ft sin a, 



sin /?, read sin a sin ft sin a, sin /? in the upper line of the ex- 

 pression ; and in the lower, for sin ft, sin A, sin ft,,, wherever 

 they occur, read cos ft, cos A, cos ft,,, respectively. 



296, 1. 4, Should be marked ...... (7.) 



299, XVI. the first equation should be 



= 



sn (> + ( + 



and the d<p in the last line should be 



301, The equation expressing the value of A should have been num- 



bered ...... (6.) 



304, 1. 7. & 9, for commensurable and incommensurable read rational 



and irrational respectively. 



1. 12, for the comma at the word functions read a full point. 



305, 1. 2, for the factor without the radical, viz. d( ^ <pj. read 



,.,"'/ (!-*) 



1. 6, from bottom,yor A 2 TT 4 read A = 2 ir 4 



307, 1. 5, for - sin (b read sin ^ 



J n n ^ 



~~ 308, 1. 2, from bott. for sin = 6 read sin (j) = eos6 



311, 1. 8, for quadrantal lines read quadrantal lunes 



1. 12, dele to, the second word of the line. 



I may here remark, that, in the figures there and elsewhere given, no 

 attempt at the accuracy of instrumental construction has been made. It 

 has been thought quite sufficient to convey a general notion of the course of 



the several curves, as projected upon a plane. 



pi 

 r~? 313, dele = from the end of the two intermediate values of cot 



