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The Purpose of the Illustrations. A number of photographsand drawings have been introduced throughout this volume. Thesephotographs are illustrative of various group ideas covering uses ofplants. Words, however carefully selected, often cannot be a literalinterpretation of an idea, whereas a photograph immediately conveysthe definite idea which cannot be reproduced in words. These il-lustrations have been selected, so far as possible, to illustrate the mainfeatures which justify the making of an individual group for referencepurposes. It is hoped that they may for that reason prove to be ofgreat value. |
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