1971] 
Jackson — W eb of Araneus 
21 
Table 3 
Frequency of some structural features of connections from the strengthening 
zone (NS-R’s). For each feature 18 NS-R’s from 2 webs built by different 
spiders were observed. Comparing this table with Table 1, note the absence 
of zero junctions, the decreased frequency of sleeves on radii, and the 
presence of loose strands along the NS. 
Percent of NS-R’s having 
Feature 
the Feature 
Zero Junction 
0 
Sleeve on Radius 
5.5 
Sleeve on NS 
22.2 
NS and Radius Both Single 
Stranded at Junction 
5-5 
Loose Strands Along Radius 
11. 1 
Loose Strands Along NS 
11. 1 
zone. Also, unlike SS-R’s, the junctions of NS-R’s always had a 
rough appearance. 
NS-R’s had sleeves on radial or spiral threads less often than 
SS-R’s. Unlike some SS-R’s, there was a sleeve on no more than 
one strand at any one NS-R. 
As at SS-R’s, a spiral thread at a NS-R often joined the radius 
as several strands. However, some SS-R’s had many more strands 
than were found at NS-R’s. 
Only two PS-R’s (Fig. 4a) were looked at, and they resembled 
NS-R’s in length and roughness of the junction, in configuration 
of threads, and in having sleeves and a number of strands. 
Is the manner in which the structure of NS-R’s and PS-R’s differs 
from the structure of SS-R’s related to differences in movement pat- 
