160 



THE MICROSCOPIST. 



ivory, or iron, is recommended by Talk & Henfrey, after Straus 

 Durekheim. The air should be pressed out of the bottle, and 



Fig. 50. 



the pipe placed in the liquid, which will rush in to fill the 

 vacuum, and it is ready for use. They also recommend a tube, 

 or pipette, with flexible stems, so constructed as to receive jets 



