72 WITH HARD CHEEKS. 



peculiarly flattened form of its head, it is enabled to thrust 

 itself, and thus to find a hiding-place. When disturbed, it 

 swims rapidly. The term Bullhead has been attached to all 

 the species of the genus Cottus, on account of the large size 

 of the head ; as we also use the words Bullfinch, Bullfrog, 

 Bulltrout, and Bullrush, to indicate species of large compa- 

 rative size. 



As the term Bullhead is thus considered to refer to the 

 large size of the head, so the name of Miller's Thumb given 

 to this species, it has been said, is suggested by, and intended 

 to have reference to, the particular form of the same part. 



The head of the fish, it will be observed by the accom- 

 panying vignette, is smooth, broad, and rounded, and is said 

 to resemble exactly the form of the thumb of a miller, as 

 produced by a peculiar and constant action of the muscles in 

 the exercise of a particular and most important part of his 

 occupation. 



It is well known that all the science and tact of a miller 

 is directed so to regulate the machinery of his mill, that 

 the meal produced shall be of the most valuable description 

 that the operation of grinding will permit when performed 

 under the most advantageous circumstances. His profit or 

 his loss, even his fortune or his ruin, depend upon the exact 

 adjustment of all the various parts of the machinery in oper- 

 ation. The miller's ear is constantly directed to the note 

 made by the running-stone in its circular course over the bed- 

 stone, the exact parallelism of their two surfaces, indicated by 



