CHAPTER III. 



A PLAN OF WORK. 



THE leaders of those chapters that desire to study 

 the scientific classification of the objects of nature 

 will do well to follow some such method as this : Con- 

 sider, first, the three great kingdoms Animal, Vegeta- 

 ble and Mineral. Let one meeting be devoted to the 

 study of each as a kingdom. Let all the objects in 

 your collection be classified so far as to determine re- 

 garding each, whether it belongs to the first, second, 

 or third of these kingdoms. Determine the same re- 

 garding a multitude of substances as air, water, milk, 

 sugar, amber, alcohol, ink, paper, steel, paint, silk, 

 flannel, steam, smoke, coal, kerosene, vinegar, etc. 



Next take up the branches into which the several 

 kingdoms are subdivided. These are for animals : 



I. Protozoa. V. Anthropoda. 



II. Ccelenterata. VI. Molluscoidea. 



III. Echinodermata. VII. Mollusca. 



IV. Vermes. VIII. Tunicata. 



IX. Vertebrata. 



Let these be carefully studied one by one, and thor- 

 oughly discussed, and illustrated by specimens, until 

 any animal can readily be referred to its proper branch. 

 If the books which contain this later classification are 

 not at your command, you will do very well with the 

 older divisions after Cuvier, viz.: 



I. Vertebrates. III. Mollusks. 



II. Articulates. IV. Radiates. 



V. Protozoans. 



