A Simple Feeding Device for Culex Pipiens in Avian Malaria Studies.

with the base and a membrane hinge is cemnented on (C). A writing lever (not shown in the illustration) is attached to the top surface. The bellows is now made ready for use by smearing generously a layer of paraffin oil on the membrane, thus not only sealing any microscopic holes, but rendering it more flexible. These bellows may be made of any volume capacity to fulfil a particular conadition of recording. It should be remembered that the more cubical the bellows is made, the more amplitude will be recorded for a certain volume change, and thus it is more sensitive but has less mechanical advantage. A useful proportion is shown in the illustration. J. R. DI PALMA J. RAYMO:ND JOHNSON DEPARTMENT OFB PHYSIOLOGY, LONG ISLAND COLLEGE OF MEDICINE