CORRIGENDA. 



The reader is requested to make the following corrections with the 

 most of which are important to the accuracy of the text. 



The lines reckoned do not include the running titles, or the word Fig. 

 standing over the diagrams. 



Page 39, line 8, for direction of c, ... read . ... e. 



40, 1, line ..................... lines. 



43, 21, tetrahedrons ............ tetrahedron. 



80, 7 from the bottom, for class n ... class o. 

 92, 2, .for deduced ................. derived. 



97, 2, together with ...... ..: and. 



5, after symbols ..... add .. . . will follow the tables of 



modifications. 

 107, 9, for 120 1 5/52".... read ....... 125 8 15'52" 



i.<.:113, 9, . 7031'43" ............... 70'31'44'' 



115, 15, 12015'52" ............... 12515>52" 



177, 6, and a rhombic base ...... with a rhombic base. 



181, 6 from the bottom, for F ....... E. 



2(Mj 6,forF ....................... E. 



207, ~. 6, after intersect .... add ...... two of. 



209, 10, for* .... ......... read .... /. 



213, 9 from the bottom, after diagonals, add, or edges. 

 218, 4, for m .......... ... read.... o. 



257,- 5, <.,., ................... > 



P i> 



260, 3 from the bottom, for P ...... A 



P P 



270, S, forGp ..................... Gq 



6, Bq ...................... Hq 



277, 2, BpB/p ................. BpB/q 



278, 19, C .............. \ ......... O 



298, -- 13, if ...................... H. 



SOI, 15, Ep ...................... Fp 



810, 10 from the bottom, for B/qB^r... B'/qB'r 

 311, 9, after = ........ add ....... R. 



12, - = ..................... R. 



3 from the bottom, for B/qB'^ read B'/qB'r 

 Sl5, 12, for cos.Ag ................. cos. A 3 



16,afersin.(l20 A 2 )..add.. : 



316, at the bottom, after = in both formulae, add R, 

 S17, 9from the bottom, for alec read ab o d. 

 319, 3 - after (7 8 /, ) add : 



322, in both formulae, after =r... add R. 



323, 10 from the bottom, fora ... read c. 



324, 2, for , and o, , ............... d, and J. 



S2G, 5 from the bottom, for cos. / 2 .. cot. 7 2 

 349, 5, fora ...................... c. 



351, 6, -- 351 .................... 353. 



11, in the formula, for sin. J t ... sin. / f 

 353, at bottom, for a e ... ........... ac. 



354, 1, for a e ...... . ............ ac. 



5, R ..................... R: 



6, after 1 ......... add . . ----- : 



377^ _ at bottom, for tang. ( 7=45) read tang. (^1 45") 



390, --- 39 2 / 30' / = ........ 392'3O"~ 



391, 5 from the bottom, for 4I5'32" . . 4l5 / 33" 

 392, 4, for4'15'32"... ............... 415 / S3 / ' 



6, 28 1 0>26" ................ . 210'27" 



