Coal gaa i Dot explosivo, ezoept trhen I with a known proportion ofo immoD air. Thehuuiidityof tl)oaUuosihurcÍ8;reatcr above fureittthaa over non-woudedground. Ëngioeenos lm raooeodsd in putting ioto steaui onlj' ubout one-tenth of the huiit rcaüzcd in tin; furBMOOfthfl Kuiler; the roinaininp nino tentlis ai e 1 The dirt'ereiicit between the btgbest speed atlaiimble by au ooeao stamer at soa in good weather and therate obtainub during agale is the pjeasare of the resselsstrength. No saffioieal reagoo las been a.ssigncd wliy sca-going mail and passenger steatners should not be of cellular constructiun. Steaui is cooled by expansión, while air is heated by compression.