The Materia Medica of the Hindus, compiled from Sanskrit Medical Works c4.s1.5

c4.s1.5

Susruta divides remedial agents into two classes, namely, *Párthiva* or material and *Kálakrita* or effected by time, such as wind, sun-shine, shade, moon-light, darkness, heat, cold, rain, day and night, changes of the moon, months and seasons of the year, etc. These are all said to affect the humours of the body, and, through them, the diseases caused by their derangement. The influence of these agents, if properly regulated or availed of, sometimes cures diseases, without the aid of material remedies.