81 
cipally upon the edges of the advancing leaves ; 
and when the leaves are sufficiently large, or at 
near their full size, they appear to be preferred 
before the younger leaves for the sustenance and 
residence of all the succeeding broods. 
The early effects produced by their nibbling 
the young leaves causes them to turn quite brown 
and to shrivel at the edges, and the effects of 
their depredations at a more advanced stage of the 
leaf will readily exliibit themselves by the top side 
of the leaves turning brown, to the extent which 
the Spider has derived support on the under side of 
the leaf. The weather most agreeable or encoui'ag- 
ing to their pursuits is dry, warm weather; cold 
and wet completely retard their progress, and com- 
pel them to retire and remain inactive. They are 
exhilerated to resume their attacks, although it may 
be only for a short interval by the presence of the 
all exhilerating sun’s rays; and as a matter of 
course they prove far more injurious to this tree 
in dry weather than when it is wet and cold. 
For THEIR Destruction. — About the lat- 
ter end of January, or the beginning of February, 
all the shreds may be taken off from such trees as 
have been annoyed by the Spider the preceding 
summer, or any other materials that may appear 
to harbour the Spider. Those which are to be 
used again should be put a few minutes into boil- 
ing water, and those not wanted or useless should 
be burnt. The motive for taking the shreds off 
now is to destroy the insects uhile they remain 
