E. & F. N. SPON, LIMITED, 57 HAYMARKET, S. W.

KG 11013

-Ph & 4059.16.5

JUL 28 1911

COPYRIGHT, 1910

By F. J. B. CORDEIRO

BURR PRINTING HOUSE
18 JACOB STREET

NEW YORK

ERRATA

On page 46, line 43, should read = C sec2 9, instead of = C sec2 9.

On page 47, line 15, should read

= 2 @ sin 9 VR' 92 + R2 cos2 9 4,2 = 2 @ sin 9 7'r,

instead of

2

= 2 sin 9 V'r.

= 2 ∞ sin 9V R2 92 + R2 cos' On page 99, line 28, should read Fig. 24 instead of Fig. 25.