— 14 — 
it. and shuts it when he likes; then he is sheltered from 
birds and insects which are fond of them. 
It must be preserved ; because it is useful for the recogni- 
tion of the species. 
Marine Shells are to be collected in quantity, dredging 
the sheltered places as near as posible of the reefs of rocks ; 
the nearer you approach the more shells you will collect. 
On the rocks and in the crevices, you will find many 
shells. 
On the sea shore, at the new and full moon, the collector 
should go and turn the stones and will be amply repaid for 
his trouble. 
After severe gales of wind, many valuable species 
brought from very far will be found ; you must not miss 
these occasions. 
Fresh water shells are to be collected in the rivers, lakes, 
and ponds ; they are found in the mud, on the edge of the 
rivers or rivulets and are generally very abundant : they 
must not be neglected. Small species are as interesting as 
the largest. 
Land Shells are found inder stones, in clefts of rocks 
under dried leaves, and other vegetable detritus, on trunks, 
