SEPTEMBER. 1949
A METHOD FOR FILTERING SMALL QUANTITIES OF SLUDGY MATERIAL JOSEPH LANGEVlN Hull, Province of Quebec, Canada
In biological work, it is often required to filter small aliquots of liquids before pipetting easily a clear sample for actual use. This is usually done by using some form of crucible (Gooch, sintered glass, porous porcelain, etc.) with or without the aid of suction, but very often the material in suspension obstructs the openings of the crucible. For many of these liquids it is sufficient merely to use a piece of Kleenex over a
small beaker; a pouch-like cavity is produced by pushing down the piece of Kleenex a suitable distance inside the beaker, thus producing a reservoir which will hold the portion of liquid to be filtered. This method is both fast and effective. I t is desirable not to squeeze the last drops of filtrate out of the paper as it may break. A better filtration may be obtained by using a double thickness of Kleenex, or by repeated filtering.
