Errata

page 8: 'whirpool'->'whirlpool' page 14: 'rcommended'->'recommended' page 42: 'envolopes'->'envelopes' page 54: 'smoke-abosrbing'->'smoke-absorbing' page 54: 'descovering'->'discovering' page 60: 'quanties'->'quantities' page 64: 'begining'->'beginning' page 85: 'horripulation'->'horripilation' page 85: 'celebacy'->'celibacy' page 96: 'descibed'->'described' page 99: 'nothern'->'northern' page 123: 'clectric'->'electric'