Anchor, to weigh up, [405], [406].

Antiquities, military, [473], [474].

Approaching blind, an, [432].

Arago, M., noticed, [369], [372].

Arithmetical instrument. [512].

Arquebuse, [466]; à Croc, [466]; noticed, [474].

Artificial fountain, [413], [414]; river, [419]; bird, [440]; ring horse, [524].

Ashmole’s Museum at Oxford, [356].

Aubrey, Mr., “a professed virtuoso,” [352].

Authors, old scientific, enumerated, [359].