Arthashastra
कला मात्रं पुरुषाणाम्, द्वि गुणं खर अश्वानाम्, चतुर् गुणं हस्त्य् उष्ट्राणाम् ॥
As much as a kalá (16th of a tola) to men; twice as much to mules and horses; and four times as much to elephants and camels.
english translation
kalA mAtraM puruSANAm, dvi guNaM khara azvAnAm, catur guNaM hasty uSTrANAm ॥
hk transliteration by Sanscript