Modern Magic: A Practical Treatise on the Art of Conjuring

It is a very good plan, in performing this trick, for the performer himself to collect the coins from the company in a plate, the coins to be added being held in the same hand which carries the plate, when, the thumb being naturally above and the fingers below, the coins are effectually concealed. After the coins have been counted, the performer, taking the plate in the other hand, pours them from it into the hand which already holds the concealed coins, thus bringing them together easily and naturally.