Fresh-water biology (1918) - PDF

Fresh-water biology (1918)
"For the ordinary student and teacher on this continent freshwater life has a significance heretofore greatly underestimated. In most parts of the country it lies at one's very door, readily accessible, and is indeed the only type of aquatic existence which can be studied Uving and at work. This fact gives to fresh-water life, once the student has been introduced into its domain, an appealing interest that fetters his attention and stimulates his desire to know something more of it." (Preface)
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