44 THE BOOK OF NATURE STUDY 



is travelling. On reaching the top horizontal line the spider 

 walks along it a little way, still holding the new line loose, until 

 the interval between two of the future main spokes has been 

 traversed, and then fixes the thread. There are now in position 

 the first three spokes of the wheel, namely, two formed by the bi- 



FIG. 28. Web of garden spider : the second spiral line has been begun. 



section of the first perpendicular thread at the point where the 

 newest thread, the third spoke, was attached. The animal now 

 returns to the centre along the last spoke, attaches a fresh thread, 

 travels back to the frame along the same spoke, walks along 

 the frame a little distance and then fastens the next spoke. This 

 process is repeated until the whole area within the frame is 



