The Classical Doctrine of Indian Medicine: Its Origins and its Greek Parallels c8.139

c8.139

³ In classical medicine *tṛtīyaka* denotes the fever which comes every third day (counting that of the first attack as the first), therefore the *tṛtīyaka* fever. Therefore the fever that comes every fourth day is called *caturthaka* and there is no mention of a fever between the daily (*anyedyuṣka*) and the *tṛtīyaka* (Suśr., Utt., XXXIX, 67-8; Car., Cik., III-34). But here, *tṛtīyaka* coming after the daily and the one coming every third day, can only be the one that comes every fourth day, the one that attacks every fourth day, excluding the day of first attack.