OCR Text |
Show f Spider ' VV.-b.. The webs of those spiders which spin nares out of doors, as the geometrical ir;iril"ii spider, are- formed of two s'rts ! of .'ilk. one of which is ued furl he main rabies ami the radiating threads, j the other fur the co-teeiuric threads. i Tliu latter are thickly studded with 1 minute lil'ibulcs i.f a vi.-cous -ubsuim-e. which retains the tly, j,'nat or moth that may I'lnndcr :u.aiit them, while the former an- quite dry and harmless. A third kind of silk in produced by the busy little spinner when suiue such large insect ;is a vap lias become en-I en-I tangled in the web and threatens to j break the delicate structure in its strng i gles. This takes the form of an enveloping envel-oping ina-ss, which is suddenly pro . dueed, and which elTectually prevents any further gyrations on the part of tho captured insect. Cornhill M;iga-liue. |