Коралловый остров

Chapter 12

           Andlookhere,"headded,pointingtothesidesofthetank,which,forthespaceoftwoinchesabovethewater-level,wereencrustedwithsalt,"youmustcarryyourphilosophyalittlefurther,Ralph.Thatwaterhasevaporatedsomuchthatitistoosaltforanythingtolivein.Youwillrequiretoaddfreshwaternowandthen,inordertokeepitatthesamedegreeofsaltnessasthesea."

           "Verytrue,Jack;thatneverstruckmebefore,"saidI.

           "And,nowIthinkofit,"continuedJack,"itseemstomethatthesurestwayofarrangingyourtanksoastogetittokeeppureandingoodconditionwillbetoimitatetheoceaninit;infact,makeitaminiaturePacific.Idon’tseehowyoucanhopetosucceedunlessyoudothat."

           "Mosttrue,"saidI,ponderingwhatmycompanionsaid."ButIfearthatthatwillbeverydifficult."

           "Notatall,"criedJack,rollinghistowelupintoaballandthrowingitintothefaceofPeterkin,whohadbeengrinningandwinkingathimduringthelastfiveminutes"notatall.Lookhere.Thereiswaterofacertainsaltnessinthesea;well,fillyourtankwithsea-water,andkeepitatthatsaltnessbymarkingtheheightatwhichthewaterstandsonthesides.Whenitevaporatesalittle,pourinfreshwaterfromthebrooktillitcomesuptothemark,andthenitwillberight,forthesaltdoesnotevaporatewiththewater.Thenthere’slotsofseaweedinthesea;well,goandgetoneortwobitsofseaweedandputthemintoyourtank.

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