. A handbook of British lepidoptera. Lepidoptera. INTRODUCTION. Method of Arrangement. The natural order of arrangement, which is that of a much- branched tree, cannot be adequately expressed by a simple linear succession, such as is alone practicable in a book. It is however possible to devise a linear succession which shall be consistent witli the natural genealogical order, if some ad- ditional explanation can be given. The method here adopted is as follows. Suppose the accompanying diagram represents a portion of the genealogical tree ; then the order will begin at M and descend to K, reco
. A handbook of British lepidoptera. Lepidoptera. INTRODUCTION. Method of Arrangement. The natural order of arrangement, which is that of a much- branched tree, cannot be adequately expressed by a simple linear succession, such as is alone practicable in a book. It is however possible to devise a linear succession which shall be consistent witli the natural genealogical order, if some ad- ditional explanation can be given. The method here adopted is as follows. Suppose the accompanying diagram represents a portion of the genealogical tree ; then the order will begin at M and descend to K, recommence at L and descend to K, and thence to G, recommence at H and descend to G and M , thence to B, recommence at F and descend to D, recommence at E and descend to D and thence to B, recommence at 0 and descend to B and thence to A, and so on. Thus the order begins with the most recently developed forms and descends gradually to (he earliest or most ancestral, which are the last in the book. To understand the order in practice, it may be assumed that each genus is descended from that which immediately follows it in the book, unless its actual descent is expressly stated otherwise ; such statement will of course require to be made before every recommencement of a fresh branch. This system has been adhered to throughout, and after a little use will not be found unintelligible. If adopted in the arrangement of a collection in the cabinet, it would be a good plan to indicate the recommence- ment of a fresh branch by a special mark, such as a red bar drawn above the first (or highest) species. In the arrangement of species within each genus the same plan has been followed ; but since a more intimate study of very minute points than has been here possible would be required to ascertain accurately the mutual affinities of forms which are often very closely related together, it lias not been thought necessary to enter into any very precise explanation of their order. Nomenclature. Th
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectlepidop, bookyear1895
