12 ILLINOIS BIOLOGICAL MONOGRAPHS [116 



cleared carefully from the phenol reagent by camsal and allowed to harden 

 for a short time in this fluid. Then they may be transferred to diaphane, 

 diluted to about one half strength by absolute iso-butyl alcohol, and 

 allowed to clear by gentle evaporation of the alcohol. A slightly greater 

 degree of clearing may be obtained by preparing the worms in the same 

 manner and transferring to pure Canada balsam with 5 to 10 per cent 

 camsal well diluted with iso-butyl alcohol. This, too, makes an admirable, 

 but very slow drying, tough, elastic medium. 



