MOLLUSCA. 11 



LESSON II. 



( To commence with a repetition of the summary of the former 

 lesson.) 



Teacher. Examine these animals again, com- 

 pare them with insects, and tell me if you 

 observe any deficiency in their construction. 



Child. They have not any limbs. 



Teacher. Very true. They have not limbs 

 or joints, as insects, nor are they divided, or 

 moved by means of rings, as worms. 



Child. Yet they move about. 



Teacher. Yes ; the greater number of 

 mollusks have the power of locomotion, that is, 

 of moving from place to place ; the term is de- 

 rived from the Latin locus, a place. We will 



required to write it as well as they can from recollection. It 

 would be desirable also that they should repeat it at the com- 

 mencement of the succeeding lesson. This process may appear 

 tedious, but the result will be most satisfactory both to the 

 teacher and pupils. The latter should acquire so clear a know- 

 ledge of the facts brought before them, and have them so well 

 imprinted on their minds, that they may, through all their 

 progress, be enabled without confusion or hesitation, to recur 

 to each preceding step. Their information should be like a 

 chain, which is held unbroken in the grasp ; and when this is 

 accomplished, a power of mind is elicited which,, independently 

 of the knowledge obtained, will prove most valuable when 

 applied to more important subjects. 



