Odors Pleasant or unpleasant smells.
Opera-glass (op'-e-ra-glas). Magnifying glasses used at the theatre or opera to make things seem nearer.
Organism (or'-gan-izm). A member of the animal or vegetable kingdom.
Orthoptera (or-thop'-tē-ra). (Gr. = straight-wing.) An insect order to which belong the grasshoppers.
Ovipositor (ō-vĭ-poz'-ĭ-tor). (L. ovum = egg, and ponere = to place.) The end of the abdomen of some insects, with which they are able to put their eggs in a good place to be hatched.
Oxygen (ok'-si-jen). A part of the air that is necessary to all animal and vegetable life.
Parasites (par'-a-sītz). Animals or plants that live on others.
Phylloxera (fil-ok-sē'-ra). (Gr. = leaf and dry.) An insect very destructive to grape vines.
Plaited (plāt'-ed). Folded length-wise like the plaits of a closed fan.
Plecoptera (plē-kŏp'-tē-ra). (Gr. = twist and wing.) An insect to which belong the stone flies.