Abstract: A generally vertical frame has a pair of columns on which an upper support and a lower support are slidably mounted, the lower support carrying the barrels of a row of syringes whose plungers are fastened to the upper support. The latter support can be alternately lowered and raised, manually by a lever or automatically by a cam, and is connected with the lower support by a lost-motion linkage allowing the two supports to be separated to an extent sufficient for a partial withdrawal of the plungers from their barrels when the syringes are dipped into one or more supply containers on a base onto which the lower support is held by a strong magnetic coupling until entrained by the rising upper support.