Economy of the Eyes

Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. Explanation of the Plate fronting the Title

Fig. I. Is the Spectacle front recommended for Eyes in general; the distance between the centres of the openings which held the Glasses being 2 1-2 inches, i.e. the...