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(a) Preparation of one lyophilic and one lyophobic sol Lyophilic sol - starch, egg albumin and gum Lyophobic sol - aluminium hydroxide, ferric hydroxide, arsenous sulphide. (b) Dialysis of ...

IT is gratifying to all who are. interested in scientific education to know that instruction in elementary science in this country is steadily improving, both in methods of teaching and in the ...