ers are Fra. 16. less unlimited. This no doubt arises from the standing wa- ters and marshy spots, in which the insect passes the first stages of its existence, being dried up in many places before the contained larve reach maturity. There is not much pro- bability, in view of the foregoing, of the… … supply of wigglers, or gnat worms, as the larve are some- times called. These, from their transparency, require no preparation for examination by the microscope, for which in- strument they form excellent objects. The insect and its transformations have always presented a most interesting sheath to…
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