ERRATA. 
Page 627, foot note, line 8 from bottom, for quadrinodal surface read quartic cy elide. 
„ 628, art. 86, before f in equation (85), omit g. 
' „ 635, art. 109, after the determinant (93), add =0. 
,, 638, art. 118, line 7, for U 2 = read U 2 =. 
„ 639, art. 121, after a 2 -f- /3 2 + y 2 + <5 2 + e 2 , add =0. 
„ 643, art. 143, line 5 from bottom, for (407) read (107). 
694. art. 278, for =(* 
705, art. 319, in equation (193) supply V Jc". 
707. art 324, the numbers 3, 4, 5, 6, 7, 8, 9, 10 in the determinant (200) should be small suffix numbers 
