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: Consider, 

 first, the three great kingdoms Animal, Vegetable 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 regarding each, 

 whether it belongs to the first, second, or third of these 

 kingdoms. Determine the same regarding a multitude 

 of substances as air, water, miJk, 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. Arthropods. 



II. Coelenterata. VI. Molluscoidea. 



III. Echinodermata. VII. Mollusca. 



IV. Vermes. VIII. Timicata. 



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. 



