[Pramāṇa](https://indike.org/pramana/) › [Studies](https://indike.org/pramana/ins) › [Science, technology and education](https://indike.org/pramana/ins.science) › [A History of Hindu Chemistry from the Earliest Times to the Middle of the Sixteenth Century A.D.](https://indike.org/pramana/ins.science.ray-1902) › v2.c32.s16.20 # A History of Hindu Chemistry from the Earliest Times to the Middle of the Sixteenth Century A.D. v2.c32.s16.20 A History of Hindu Chemistry from the Earliest Times to the Middle of the Sixteenth Century A.D. v2.c32.s16.20 - **Language:** English ### [v2.c32.s16.20](https://indike.org/pramana/ins.science.ray-1902.v2.c32.s16.20) ‡ The ruby and the sapphire are only varieties of corundum, Varāha classes corundum as a species of ruby, the former being dotted over with black and white patches and feeble in lustre \[i. e. the non-transparent or coarse kind\]. It is scarcely necessary to - [Previous: v2.c32.s16.19](https://indike.org/pramana/ins.science.ray-1902.v2.c32.s16.19) - [Next: v2.c32.s16.21](https://indike.org/pramana/ins.science.ray-1902.v2.c32.s16.21) - [Up: v2.c32.s16](https://indike.org/pramana/ins.science.ray-1902.v2.c32.s16) --- Source: [https://indike.org/pramana/ins.science.ray-1902.v2.c32.s16.20](https://indike.org/pramana/ins.science.ray-1902.v2.c32.s16.20) · Pramāṇa