A new and sensitive method of injecting the vessels of small embryos, Etc., under the microscope

Abstract

The Anatomical Record. 207flowing through this passage may be reduced to any desired point.The outlet tube, H, leads from the chamber D to the burner connection.The capillary, EF, leads to a bulb of sufficient size; the larger the.more sensitive the instrument.Either the large bulb with inside capillary, J, to be filled with mercury and alcohol, or the smaller simple bulb for mercury alone may be used.A side arm is attached to one side of the capillary EF, for conveniently controlling the height of the mercury column.Either the curved capillary tube with stopcock and a cup on the end, or the simple tube with metal screw cemented in, may be used here, according to the purpose which the regulator is to serve.These parts have been previously described by N o ~y .~ The chief advantage of this regulator lies in the fact that the parts upon which the action depends are absolutely fixed in their proper relation.This is not the case in other regulators.The minimum opening is readily adjustable and its mechanism is very simple.Cleaning and refilling the instrument requires care, but presents no great difficulties.A New and Sensitive Method of Injecting the Vessels of Small Embryos, Etc., Under the Microscope.