98 NATURE STUDY IN SCHOOLS. 



of lime which makes the gorgonia heavy, so when this has been washed away 

 the light phosphate axle is left, which being too light to withstand the wind 

 is soon blown over the land. The next rain dissolves the phosphate of lime 

 which trickles down into the openings of the coral rock. 



This has an attraction for the carbonate of lime, of which the coral rock 

 is composed, and they unite, forming a hard, rocky substance. 



Bones are ground and used as fertilizers, so this rock consisting of the 

 same materials as bone, is used in the same way, and ships are sent from 

 all parts of the world to get it. 



The red gorgonia, used in jewelry and commonly called coral, is found 

 only in the Mediterranean Sea. 



The gorgonias growing near the Bahamas are valuable only as fertilizer, 

 for the red species has never been found there, The Bahama government 

 has offered ten thousand dollars to the first person who finds this variety 

 giowing within its limits. 



LESSON ON BIOLOGY IN A NINTH GRADE, 

 WILLIAMS SCHOOL, AUBURNDALE, MASS. 



BY 



John O. Godfrey. 

 Biology, by Mar ga rat L. Kingsbury. 



Natural science is divided into biology and geology. Geology treats of 

 inanimate things, and biology, as the science of life, treats of animate things. 

 Biology is then divided into botany and zoology, while the latter also includes 

 physiology. These are the chief divisions, although there are many others. 



It is very hard to draw the line between plants and animals. Some 

 German scientists have, therefore, formed a third class, but these objects are 

 generally called plant-animals, and are usually very minute. 



Animals are divided into two groups, one-celled, or protozoa, and many- 

 celled, or metazoa. The one -celled hold a \ery low place in animal life. 



Chalk is made of lime, and ail lime- stone is of organic origin. It is 

 built up by the little animal, very much as the polyp builds up the coral. 

 The little animal that makes it is one of the protozoa. It once lived in the 

 sea and gathered lime, in much the same way that coral polyps do. Marble 

 is crystallized lime-stone. 



The first land which appeared waa formed mostly of lime-stone. It was 

 at first level, but hills, mountains, and valleys were soon formed by volcanos. 



