ROTIFER. 163 



in most waters where decaying vegetables are 

 found ; or a store of them may be kept in a jar 

 by following a plan which has been mentioned 

 to me by one interested in the subject. " Fill 

 a three- or four-gallon jug with rain-water (not 

 butt- water), which will serve for a year or two to 

 keep a half-pint mug at the same level (with 

 water from the jug). Into the mug put a few 

 sage-leaves tied together, and when they are not 

 to be obtained, in winter, a little bundle of hay 

 about the size of the joint of a finger will answer 

 as well. When the sage-leaves decay and sink, 

 put in a fresh supply ; the Rotifer vulgaris will 

 always be found at the surface near the sage- 

 leaves ; and when dirt forms at the sides of the 

 mug, if a small portion of it be taken up with 



