13 MARCH 1886, Page 27

Key to the Elements of Euclid, by J. S. Mackay,

M.A. (W. and R. Chambers), contains the solution of a great number of deductions on Euclid I.-IV. and VI., and some miscellaneous matter. It com- pletes what is a most valuable addition to the study of Euclid.-- With this may be mentioned Euclid L With Notes and Exercises. By Braithwaite Arnett, M.A. (Deighton, Bell, and Co.)