As I have before intimated the circles of the web are not con¬ 
centric, or spiral, as in the regular web of the common spider. 
They do not pass completely round a common centre, but are cast 
over the upper radii in loops and brought back upon themselves in • 
an opposite direction, never passing a point above the focus. In 
this web some of the circles (and this is a peculiarity of this spider) 
as well as the radii, guys, and stays, are made of the dry silk. 
Third. The triangular web. Professor Wilder, of Cornell Uni¬ 
versity, found a spider a few years ago near Ithaca, N. Y., which 
does not seem to have fallen under the notice of observers else¬ 
where. He calls it the “triangular” spider from the fact that it 
builds a web, not geometric or eccentric, but triangular in shape, 
and this triangular shape is proof of a purpose which shows al¬ 
most human intelligence. A base line as a stay or support of the 
web is attached vertically to the trunk of a tree adhering only at 
the two ends. From this four lines, always this number and no 
more, start at equal distances from each other and converge to an 
apex, or acute angle, and then extend as a single line to some fixed 
point. These four lines correspond to the radii in the ordinary 
web, and the transverse elastic lines correspond to the concentric 
circles of the same. The web when finished is considerably longer 
than the distance between the two joints G f attachment and this 
slack line is for a purpose which is the most striking evidence of 
the intelligence of this spider. The spider takes up the slack her¬ 
self ; and wonderful as is the piece of work which she has accom¬ 
plished, her management of this web in taking her prey is still 
more wonderful. Although in spinning the ten transverse lines 
she is believed to make 9,000 movements with her hinder feet, 
yet, without a moment’s rest, she takes her place when the web is 
finished, on the single line between the apex and the point of at¬ 
tachment behind her. Hauling the single line taut behind her 
with her hinder feet, she draws in the web and makes it taut with 
her first and second pairs of feet, precisely as a man would haul a 
sagging hammock by pulling at the single line at the end. The 
third pair of feet when desired may lightly hold the slack rope. 
She is now ready for business. For hours, if necessary, she 
holds her place pulling taut the line and keeping the web firm in 
position. When the unlucky insect comes in contact with her 
