A History of Hindu Chemistry from the Earliest Times to the Middle of the Sixteenth Century A.D. v2.c35.6

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).