We went frequently to see Mr. Babbage while he was making his Calculating-machines. He had a transcendant intellect, unconquerable perseverance, and extensive knowledge on many subjects, besides being a first-rate mathematician. I always found him most amiable and patient in explaining the structure and use of the engines. The first he made could only perform arithmetical operations. Not satisfied with that, Mr. Babbage constructed an analytical engine, which could be so arranged as to perform all kinds of mathematical calculations, and print each result.

Nothing has afforded me so convincing a proof of the unity of the Deity as these purely mental conceptions of numerical and mathematical science which have been by slow degrees vouchsafed to man, and are still granted in these latter times by the Differential Calculus, now superseded by the Higher Algebra, all of which must have existed in that sublimely omniscient Mind from eternity.

Many of our friends had very decided and various religious opinions, but my husband and I never entered into controversy; we had too high a regard for liberty of conscience to interfere with any one's opinions, so we have lived on terms of sincere friendship and love with people who differed essentially from us in religious views, and in all the books which I have written I have confined myself strictly and entirely to scientific subjects, although my religious opinions are very decided.