246 THE SOLIDS. 



which it has hitherto been discovered in man and the mam- 

 malia. 



Thus in the bronchi and trachea, it may be presumed to 

 be designed to facilitate the escape from those passages of 

 any foreign particles which may have found entrance to 

 them. 



Again, in the fallopian tubes and upper portion of the uterus, 

 it can scarcely be questioned, but that its use is to hasten the 

 progress of the ovum from the ovary to the uterus ; and, pre- 

 suming that the direction of the action of the cilia may be, 

 and is sometimes reversed, the vibratile epithelium of these 

 parts may be further intended to insure the more speedy 

 transmission of the seminal fluid along the fallopian tubes to 

 the ovary, upon which it has been detected by more than one 

 observer. 



