OF THE FERNS AND FLOWERING PLANTS. 173 



have recourse to crushing or careful skinning and unrolling. 

 . . . When parts are shrivelled or dried up, as is always 

 the case in herbaria, they must be relaxed by immersion 

 in boiling water. 



< ' In all cases where dried flowers are to be dissected, the 

 air should be driven out by boiling for a short time, before 

 any attempt is made to separate their parts.' — Ed.] 



