Kautilya's Arthashastra 4.8.22

4.8.22

paraṃ pāpakarmaṇāṃ nava vetralatāḥ, dvādaśa kaśāḥ, dvāv ūruveṣṭau, viṃśatir naktamālalatāḥ, dvātriṃśattalāḥ, dvau vṛścikabandhau, ullaṃbane ca dve, sūcī hastasya, yavāgūpītasya ekaparvadahanam aṅgulyāḥ, snehapītasya pratāpanam ekam ahaḥ, śiśirarātrau balbajāgraśayyā ca //

As to persons who have committed grave offences, the form of torture will be nine kinds of blows with a cane:--12 beats on each of the thighs; 28 beats with a stick of the tree (naktamála); 32 beats on each palm of the hands and on each sole of the feet; two on the knuckles, the hands being joined so as to appear like a scorpion; two kinds of suspensions, face downwards (ullambane chale); burning one of the joints of a finger after the accused has been made to drink rice gruel; heating his body for a day after be has been made to drink oil; causing him to lie on coarse green grass for a night in winter. These are the 18 kinds of torture.