[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.c35.6 # A History of Hindu Chemistry from the Earliest Times to the Middle of the Sixteenth Century A.D. v2.c35.6 A History of Hindu Chemistry from the Earliest Times to the Middle of the Sixteenth Century A.D. v2.c35.6 - **Language:** English ### [v2.c35.6](https://indike.org/pramana/ins.science.ray-1902.v2.c35.6) Perception :—The conditions of perception, and its range and limits, were carefully studied. The minima sensibile (\*e.g.\*, the minimum visibile, the Trasarenu, the just perceptible mote in the slanting sunbeam), the infra-sensible (अनुद्भूतरूप सूक्ष्म, sometimes termed अतीन्द्रिय), the obscured (अभिभूत, \*e.g.\*, a meteor in the mid-day blaze), and the potential (अनुद्भूतवृत्ति), are distinguished ; but finer instruments of measurement were wanting, and this was a principal cause of arrested progress. It may be noted that the measurement of the relative pitch of musical tones was remarkably accurate and original (\*vide\* my Paper on Hindu Mechanics and Physics). - [Previous: v2.c35.5](https://indike.org/pramana/ins.science.ray-1902.v2.c35.5) - [Next: v2.c35.7](https://indike.org/pramana/ins.science.ray-1902.v2.c35.7) - [Up: v2.c35](https://indike.org/pramana/ins.science.ray-1902.v2.c35) --- Source: [https://indike.org/pramana/ins.science.ray-1902.v2.c35.6](https://indike.org/pramana/ins.science.ray-1902.v2.c35.6) · Pramāṇa