1442 THE STORY OF THE UNIVERSE 



so nearly alike in size and outline that the whole 

 forms an almost straight rod, slightly tapering to the 

 tip. Each joint, however, sends forth two long 

 straight branches, so disposed that the pair make a 

 very acute angle, and the whole double series of 

 seventy on each side form a deep narrow groove. 

 These two series of branches, being perfectly regular 

 and symmetrical, impart to the antennae the aspect 

 of exquisite feathers. 



It is, however, when we examine the elements of 

 this structure in detail, using moderately high powers 

 of enlargement, that we are struck with the elab- 

 orateness of the workmanship bestowed upon them. 

 Each of the lateral branches is a straight rod, thick 

 at its origin, whence it tapers to a little beyond its 

 middle, and then thickens again to its tip. Here two 

 horny spines project from it obliquely, one much 

 stouter than the other, at such an angle as nearly to 

 touch the tip of the succeeding branch. 



Besides this, each branch is surrounded throughout 

 its length with a series of short stiff bristles, very 

 close-set, projecting horizontally (to the plane of the 

 axis of the branch), and bent upward at the end 

 candelabrum-fashion. The mode in whi.ch they are 

 arranged is in a short spiral, which makes about 

 forty-five whorls or turns about the axis; at least in 

 the branches which are situated about the middle of 

 the antenna?; for these diminish in length toward the 

 extremity, bringing the feather to a rather abrupt 

 point. 



The entire surface of the branch gleams under re- 

 flected light with metallic hues, chiefly yellows and 



