AS REGARDS SPIDERS. 



675 



cold weather ; some inhabit the cellar, and others establish themselves 

 in the corners of rooms, the angles of windows, openings in the wood- 

 work, or chinks in the walls, and each has its special adaptations and 

 modes of life. 



Fig. 1. 



The Female House-Spider (Tegenaria domesiica), as seen -with a Magnifier. a , Eyes ; b b, Mandi- 

 bles ; c c, Maxillary Palpi. 



ing-glass 



Fig. 1 represents a small house-spider as seen under a magnify- 

 It has eight eyes, simple in structure, and incapable of mo- 

 tion, but disposed in two rows on the top of the head, so that they 

 enable the creature to espy its prey, from whatever quarter it may ap- 

 proach. Fig. 2 is this part of the animal represented still more highly 



magnified. 



Fig. 2. 



Enlarged View of Anterior Portion of Cephalothorax, bowing the Eight Eyes, and Hairs. , one of the 



Hairs magnified. 



Spiders, being carnivorous, must make other creatures their pre} 7- , 

 and they are very effectually provided with the means of doing so. 

 No other animal is so terribly armed. Below the eyes (Fig. 1, b b) 

 you perceive the large basal joints of the jaws, or mandibles as they 

 are termed, with which they do their small work of butchery. Fig. 3 

 shows the appearance of this deadly instrument greatly magnified. 

 "Picture to yourself a pair of huge, sharp-pointed jack-knives with ex- 

 tremely broad handles, the blades being so opposed to one another, 

 that, when they are forcibly driven into an object, their pointed extreni- 



