74 



METHODS OF MICROSCOPICAL RESEARCH. 



perforated india-rubber stoppers. A glass tube 

 reaching nearly to the bottom of the bottle passes 

 through the central stopper; each of the other 

 stoppers is fitted with a glass tube projecting but 

 little beyond the stopper into the bottle, but pro- 



jecting sufficiently above the stopper to admit of 

 a piece of india-rubber tubing, of the diameter used 

 for infant's feeding bottles, being fixed upon it. 

 A basin, or still better, a water-bottle, of a 



