28 



JOURNAL OF THE 



* Nest was. destroyed and another built. 



Variation'^ fvdin the normal ti/pr. By the normal type is 

 meant that which seems to be the simplest, most nearly per- 

 fect, plan of construction, is followed by a majority of those 

 observed, and seems to indicate a vafiind hisifind, a more 

 potent influence of inherited habit in some, while in others 

 the instinct seems to be latent at first and gradually unfolds 

 with the dawning of consciousness ! According to the nor- 

 mal type, the spider takes up pellets of earth with its man- 

 dibles, and turning around, places them upon the soil by the 

 side of the tube, which is being dug ; or carries or throws 

 them to a short distance. Occasionally with its spinnerets 

 it applies viscid liquid to the pellets and QdgQ of the tube, 

 much as an artificer would alternately place cement and 

 bricks in the construction of a column. The trap-door is 

 built in the same manner, by beginning, at one side of the 



