Art-studies from nature, as applied to design : for the use of architects, designers, and manufacturers . Fig. 4. arranged upon a uniform system. The radiating effect of thesetubercles ranged around the involutions of the shell is verypleasing. The Ammonites Grenouilloxi (Fig. 5) offers another variety,which shows the folds gradually being elevated, as these approachthe mouth of the shell, into bosses, by which, of course, increasedstrength is secured where the shell becomes more open, and con-sequently weaker; at the same time they give a pleasing varietyto the form of the shell itself. FORMS
Art-studies from nature, as applied to design : for the use of architects, designers, and manufacturers . Fig. 4. arranged upon a uniform system. The radiating effect of thesetubercles ranged around the involutions of the shell is verypleasing. The Ammonites Grenouilloxi (Fig. 5) offers another variety,which shows the folds gradually being elevated, as these approachthe mouth of the shell, into bosses, by which, of course, increasedstrength is secured where the shell becomes more open, and con-sequently weaker; at the same time they give a pleasing varietyto the form of the shell itself. FORMS OF ORGANIC REMAINS. 189 The Ammonites contrarius (Fig. 6) presents many distinguishingcharacteristics, which are important to the naturalist as distinctivemarkings, and furnish the artist with a variety of simple elegancewhich deserves his study. The peculiar arrangement of the ribs,curving off right and left from a line running along the centre ofthe shell, gives rise to the formation of a series of festoon-like ribs,which add much to the general beauty of this Fig. 5- The general principle, remarks Dr. Buckland, ol dividingand subdividing the ribs, in order to multiply supports as thevault enlarges, is conducted nearly on the same plan, and for thesame purpose, as the divisions and subdivisions of the ribs beneaththe groin work in the flat vaulted roofs of the florid Gothic archi-tecture. In all these arrangements, and also in the bosses ortubercles, we have varieties giving both additional strength andbeauty. A striking uniformity is found to prevail in even thoseshells of the Ammonites which seem the most complicated ; and 190 ART-STUDIES FROM NATURE. the elegance of their general appearance will be found to be dueto the repetition, at regular intervals, of one symmetrical systemof forms. In many of these fossil shells the pearly plates aredovetailed together in a curious and beautiful manner, the regulardisposition of the sutures producing a very elegant foliate
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Keywords: ., bookcentury180, bookdecade1870, booksubjectdecorationandornament
