Vili CONTENTS. 
639. 
An elementary construction in optics ...... 
Messenger of Mathematics, t. vi. (1877), pp. 81, 82 
PAGE 
28 
653. 
640. 
Further note on Mr. Martin’s paper...... 
Messenger of Mathematics, t. vi. (1877), pp. 82, 83 
29 
654. 
641. 
On the flexure of a spherical surface ..... 
Messenger of Mathematics, t. vi. (1877), pp. 88—90 
30 
655. 
642. 
On a differential relation betiveen the sides of a quadrangle 
Messenger of Mathematics, t. vi. (1877), pp. 99—101 
33 
656. 
643. 
On a quartic curve with two odd branches .... 
Messenger of Mathematics, t. vi. (1877), pp. 107, 108 
36 
657. 
644. 
Note on magic squares ... 
Messenger of Mathematics, t. vi. (1877), p. 168 
38 
658. 
645. 
A Smith’s Prize Paper, 1877 
Messenger of Mathematics, t. vi. (1877), pp. 173—182 
39 
659. 
646. 
On the general equation of differences of the second order 
Quart. Math. Journ., t. xiv. (1877), pp. 23—25 
47 
660. 
647. 
On the quartic surfaces represented by the equation, symmetri 
cal determinant =0 ....... 
Quart. Math. Journ., t. xiv. (1877), pp. 46—52 
50 
661. 
662. 
648. 
Algebraical theorem ......... 
Quart. Math. Journ., t. xiv. (1877), p. 53 
57 
649. 
Addition to Mr. Glaisher’s Note on Sylvester s paper “Develop 
ment of an idea of Eisenstein ”...... 
58 
663. 
Quart. Math. Journ., t. xiv. (1877), pp. 83, 84 
664. 
650. 
On a (piartic surface luith tivelve nodes ..... 
Quart. Math. Journ., t. xiv. (1877), pp. 103—106 
60 
665. 
651. 
On a special surface of minimum area ..... 
63 
Quart. Math. Journ., t. xiv. (1877), pp. 190—196 
. 
666. 
652. 
On a sextic torse ......... 
68