Show Earthworms Require Moisture Earthworms thrive In almost all aU kinds of soils but they prefer those containing considerable organic matter and they must have abundant abundant abundant i dant moisture For this reason they are least numerous in very sandy areas arena They commonly inhabit the upper 18 Inches of cf the soil but Darwin Darwin Darwin Dar Dar- win has shown that they may descend descend de de- as much as six feet or more when necessary There are many kinds of them most of which live Uve In the soil but some lame live entirely entire entire- ly in water Various species dither differ in size some lome in the tropics attain a length of six feet but the common common common com com- mon varieties found here seldom grow longer than lItan 10 Inches |