Anyone who has prepared autogenous vaccines has no doubt found the shaking up of the suspension by hand, as recommended by Wright, a tedious process. There are several mechanical agitators for the emulsification of large quantities of fluid, but I have been unable to find anything well adapted to the preparation of bacterial suspensions as used in vaccine work. In several instances mechanics have made on special order devices for this purpose, but these have been produced at a considerable expense. The device described was made under the direction of Professor Hunter of the College of Engineering, and is reported because of its slight expense and its simplicity.
A second-hand sewing-machine was bought for fifty cents. Much of the machinery was removed, being unnecessary, leaving the wheel and the needle-bar. On the top of the needlebar was attached a bronze cylinder ⅞ by 5½ in. as shown in the illustration