1) MRS. MARY (FAIRFAX) (1780-1872).-Mathematician and writer on science, _dau._ of Admiral Sir William G. Fairfax, _b._ at Jedburgh, was twice _m._, first to Mr. Greig, an officer in the Russian Navy, and second to her cousin Dr. William S. Although she had early manifested a taste for study, and specially for science, she had, until after the