no Lessons in Nature Study. 



II. Carnivorous Teeth (Fig. 30, 2). 



Carnivorous teeth are best obtained by securing the head 

 of a cat, dog, or some other flesh- eating animal. When you 

 cannot get such a skull, the best thing to do is to lay a liv- 

 ing dog or cat under contribution. Call attention to the 

 greater number of incisors, the long sharp cuspids, the 

 narrow edges of the back teeth. It is easy to discover the 

 vast difference between teeth of this kind and those of a 

 boy or girl. Bring out the adaptation displayed in giving 

 us grinding teeth, and giving to the cat family teeth for 

 tearing and cutting. Make comparisons to show that both 

 have enamel, both have roots, both have cement and dentine. 



III. Herbivorous Teeth (Fig. 30, 3). 



From the butcher you can get cow teeth, and from the 

 veterinary surgeon horse teeth, and the farmer or butcher 

 will supply you with sheep teeth and swine teeth and tusks. 



IV. Fish's Teeth (Fig. 30, 4). 



Procure a fish head. Open the mouth. Pass it around, 

 so that all may see. The teeth are not atone in the jaw. 

 They are all over the sides of the mouth and the roof of it. 

 They are upon the tongue, and away down the throat. 

 Run your finger down the throat and feel them. Note 

 their shape, their lack of root, and their exceeding small- 

 ness. If you can show some shark teeth, you will add to 

 the interest. 



V. Omnivorous Teeth (Fig. 30, 5). 



To this class belong the teeth of hogs and bears. Men's 

 teeth are really of this kind. Institute comparisons as be- 

 fore, being sure to bring out the fact that these teeth are 

 like those of the flesh-eaters in some respects, but that they 

 are like those of the herb-eaters in other respects. In 

 other words, nature wisely adapted the teeth of animals to 

 eat different kinds of food. This adaptation of teeth to 



