* 
A TREATISE 
ON 
ANALYTICAL GEOMETRY 
THREE DIMENSIONS, 
CONTAINING THE 
THEORY OF CURVE SURFACES, 
AND OF 
CURVES OF DOUBLE CURVATURE. 
BY J. HYMERS, D.D. 
FELLOW AND TUTOR OF ST JOHN’S COLLEGE, CAMBRIDGE. 
THIRD EDITION, ALTERED AND REVISED 
PRINTED AT THE UNIVERSITY PRESS, 
FOR 
CAMBRIDGE: 
J.SîJ.J. DEIGHTON, AND MACMILLAN & CO., CAMBRIDGE. 
WHITTAKER & CO., LONDON. 
M.DCCC.XLVIII.