OF CONCHOLOGY. 101 



dom can be come at, without some 

 assistance of the kind. It should 

 always be carried in the pocket, when 

 a person goes a-walking ; and in 

 botanizing excursions, when in search 

 of aquatic plants, a few rare shells 

 may be at same time picked up in 

 ditches, &c. It must be understood, 

 that shells which inhabit fresh water, 

 from their colour are very difficult to 

 be seen in their places of abode, being 

 in general so much like the bottom of 

 the ditches ; of course the collector is 

 not to content himself with only taking 

 those shells he can observe, but must 

 frequently rake the bottom, and also 

 among plants, and weeds, when he 

 will in general find shells which were 

 hidden from his view. In very fine 

 sunshine days in summer, shells which 

 inhabit fresh water, are either floating 

 on the surface of the water, or crawling 

 on aquatic plants : and land shells, are 

 generally seen crawling abroad in 



