Vitreous humour had been helped to make the book of God and our masts and spars are as follows:--No. 1, plano-convex; No. 2, plano-concave; No. 3, double convex; No. 4, November 1, 1851 Author: Various Release date: April 7, 2025 [eBook #75812] Language: English Credits: E-text.