

Section of the skin 

 of a lizard 





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Section of the skin 

 of a salamander 



MEMBRANES AND SCALES 



The moist outer covering of a salamander is a living membrane which loses water 

 readily. The dry scaly covering of a lizard is really dead tissue which is relatively 

 impervious to water. We can see how quickly a frog loses water by balancing one 

 on a scale in a warm, dry room for only a few minutes 



BLOWOUT IN INDIANA DUNES 



Most living things find the extreme heat and dryness of a blowout in the dunes in- 

 tolerable. In brilliant sunshine the sand catches and reflects the light until a person 

 walking through the blowout feels as if he were in a reflector oven. Dune grasses 

 and some other species eventually get a foothold even in this desiccated environment 



