What is having the qualities of alkaline salts extracted from wood ashes. Lixivial salts (Old Chem.), salts which are obtained by passing water through ashes, or by pouring it on them called?

lixivial — Having the qualities of alkaline salts extracted from wood ashes. Lixivial salts (Old Chem.), salts which are obtained by passing water through ashes, or by pouring it on them. (Webster's 1913.)