IN CHEMISTEY. 97 



6. Is there not a compensation in the sea-plants, fish, etc., 

 which are washed back on the land ? 



(See Answer to Question 5.) 



7. Since " all the rivers flow to the sea" why is it not 

 full? 



Because of the constant evaporation from its surface. 



8. What is the cause of the tonic influence of the sea 

 breeze ? 



There are traces of certain minerals which probably 

 give to the sea breeze a bracing influence. The air from 

 the ocean is also, doubtless, highly ozonized. Persons 

 with delicate lungs, therefore, find the sea breeze too 

 corrosive. In England, rheumatic and other inflammatory 

 diseases are more abundant near the coast than inland. 



9. When fish are taken out of the water, and thus 

 brought into a more abundant atmosphere, why do they die ? 



Fish inhale O through the fine silky filaments of their 

 gills. When a fish is drawn out of H 2 O, these dry up, 

 and it is unable to breathe, although it is in a more 

 plentiful atmosphere than it is accustomed to enjoy. 



10. Do all fish die when brought on land? 



(See Key, page 51, Question 15.) 



11. What weight of water is there in 100 Ids. of sodium 

 sulphate (Na 2 SO 4 ,ioH 3 O), or Glauber's salt 1 } 



ioH a O : Na 2 SO 4 ,ioH 2 O : : x : zoo Ibs. 

 180 : 322 : : x : 100 Ibs. 



322 x 18000 Ibs. 



x = 55.9 Ibs. (H..O). 



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