1971] 
Jackson — W eb of Araneus 
17 
Table 1 
Frequency of some structural features of sticky spiral to radius connections 
(SS-R’s). For each feature, 49 SS-R’s from 15 webs built by 8 different 
spiders were observed. Note that each SS-R had a sleeve on the radius at 
the frame side of the junction and that SS’S never had loose strands. 
Feature 
Percent of SS-R’s 
having the feature 
Zero Junction 
22.4 
Sleeve on Radius at 
Frame Side of Junction 
100 
Sleeve on Radius at Hub 
Side of Junction 
46.9 
Sleeve on SS 
55-1 
SS and Radius Both 
Single Stranded at 
Junction 
36.7 
Loose Strands Along Radius 
35 A 
Loose Strands Along SS 
0 
urements made on various features. We will draw attention to 
some of the questions suggested by these observations, and possible 
directions for further research will be indicated with hypotheses con- 
cerning function and origin of the structures. 
Sticky Spiral to Radius Connections: 
In reading the following section, the readers may refer to Table 1 
and Table 2 for data pertaining to SS-R’s. 
We will define a “junction” as the space along a thread at which 
another thread is fastened to it. By “connection” we will mean 
