Lot Essay
A reprint of the optical essays of James Gregory, Descartes, Schooten, Huygens, Halley, and Barrow. "Arrived at an advanced period of life ... it was discovered that the greater part of the present volume had been printed, and its existence forgotten for some time. Apprized of this, Mr. Baron Maseres, in his 90th year, requested my [Babbabge's] assistance in conducting to its termination a work which had so long been dormant" (preface p. 3).