294 LIVING THINGS IN THEIR ENVIRONMENT 



one tree had a lot of holes in which acorns were lodged. I couldn't 

 see how they got there, for the tree was a pine and there were no 

 rats near. Who can tell me what caused this to happen? 



PROBLEM VII. LIFE ON THE SEASHORE 



How to Equip Yourself for a Collecting Trip. If you 

 live near enough to the coast to take a collecting trip to 

 the seashore, you will be repaid by seeing examples of 

 life that are not found in fresh water. For such a trip 

 you should have a large pail, a few pint jars or wide-mouth 

 bottles with corks for holding specimens, a small spade, an 

 old knife or a small iron bar for prying off animals fastened 

 to the rocks, a small pair of tweezers, and, if possible, a 

 hand lens or reading glass. 



Life Zones. Evidently the salts in the water control 

 the life in the environment, for the forms most found 

 have no near relations inland where these salts are lack- 

 ing. We find the environment along the shore is marked 

 off into zones of life ; first, an upper zone of dry sand and 

 rocks drenched by salt spray during storms ; next, an 



American Museum of Natural History 



Can you find the life zones mentioned in your text in this picture ? 



