VIII LE TABLEAU STERÉOMÉTRIQUE

in the instances which I hâve sabjected to critical

analysis, I liave found the rule to work most admirably — combining eoiuprehensiveness, utility with simplicity and great exactness. It will render a study heretofore charged with difficulty and abstruseness at once easy and acceptable — modernizing that which was ancient and which from its niultitudinous forniulae had become an isolated branch of Mathematics. Believing it to be of nniversal use, I shall heartily lend myself to the introduction of your System. Dec. 26, 1871. Horatio R. X. Bigelow, M. A.