THE ARMATURE OF ORBWEBS: VISCID SPIRALS. 93 
ningwork at the point where it was abandoned and finished it in the usual 
manner, so that the orb presented the appearance shown at Fig. 87. The 
spirals were not only greatly deltated by the action of the rain, the crossed 
lines being merged and twisted together at the middle part, but the beads 
upon them had been taken up by the raindrops, a number united into one, 
so that instead of the ordinary condition of a vast number of minute beads 
spread entirely along the line there appeared a much smaller 
number of beads of larger size, that distinctly showed to the 
ed Bead- ; See 
ing Fin. Déked eye. Then the unexplained mystery of the Orchard spider's 
ished. peculiar snare flashed upon my mind! At once the mystery 
was solved, and that in a most simple and natural way. The 
peculiar appearance of the orb was simply the result of the spiders resum- 
ing arrested work upon the spirals after the same had been abandoned on 
account of a shower, and which in the meantime had been twisted and 
deltated by the action of the elements; and the size and grouping of the 
beads changed. As the renewed work was spun in, in the ordinary way, 
both as to the position of the lines and the size of the beads, the con- 
trast with the larger beads and the more widely separated spirals of the 
earlier belt was very great. It was not the first time that I learned the 
valuable lesson that natural phenomena are often to be explained by the 
simplest and ordinary causes, while we are vainly speculating and philoso- 
phizing over some supposed occult and mysterious reason. 
Interrupt- 
EGE. 
Mr. Blackwall remarks that “the estimate of the number of viscid 
globules distributed on an elastic spiral line in a net of Epeira apoclisa of 
a medium size will convey some idea of the elaborate operations 
of the Epeiroide in the construction of their snares.”! This quo- 
tation evidently indicates that Blackwall supposed the viscid glob- 
ules to be the result of “elaborate operations” on the part of the Orbweaver, in 
other words, that they are formed by direct and intentional action. This 
has been the well nigh universal belief. But in the light of the 
true mode above recorded, it is necessary to diminish by so much 
the credit heretofore bestowed upon this child of Arachne. 
It would be an extremely laborious, if not impossible task, to ascertain 
the exact number of beads upon an orbweb, but I reached a near enough 
approximation by the following process: A sector of a snare was taken, that 
is, a complete section extending from the hub to the circumference between two 
radii, and the number of beads thereon was carefully counted. 
This sector was then measured and the superficial area calculated. 
The superficial area of the entire beaded space having been obtained 
in like manner, the number of beads upon the whole web was readily calcu- 
Number 
of Beads. 
An Error 
Corrected 
Number- 
ing Beads 
1 Jour. Linn. Soc., 1829, Vol. XVI., page 477, and Ann. Mag. Nat. Hist., Vol. XV., page 239. 
