. Il libro dell'uccello britannico. Le ali del genitore del thebee, o le ali gorgeously-coperte della farfalla.IT è WEU degno mentre. Se questo esame è fatto con molta attenzione, e con l'aiuto di una lente d'ingrandimento, si avrà che le ali anteriore e posteriore sono inchiostrate insieme nell'ala dell'ape, da un delicato meccanismo di uncini. Le falene, ma non nelle farfalle, una setole, o talvolta 146 due o tre setole, servono allo stesso scopo. Inoltre, nel caso dell'ape si scopre che l'ala anteriore, quando è a riposo, viene ripiegata longitudinalmente su se stessa. Infine, voltare verso le mosche.
1193 x 2095 px | 20,2 x 35,5 cm | 8 x 14 inches | 150dpi
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Questa immagine potrebbe avere delle imperfezioni perché è storica o di reportage.
. The British bird book . parent wings of thebee, or the gorgeously scale-covered wings of the butterfly.It is weU worth while. If this examination be done verycarefully, and with the aid of a magnifying glass, it will befound that the fore and hind wings are yoked together inthe wing of the bee, by a delicate mechanism of hooks. Inthe moths, but not in the butterflies, a bristle, or sometimes 146 two or three bristles, serve the same purpose. Further, inthe case of the bee it will be found that the fore-wing, when atrest, is folded longitudinally back upon itself. Finally, turn to the flies. Herein it will be seen thatthere is but a single pair of wings, the hind pair having becomereduced to mere stumps, known as balancers. Much, very much more, might have been said of thesewings : but our conversation is of birds. We cannot, how-ever, properly appreciate either the essential characters oftheir wings, or their flight, without some such standards ofcomparison as is afforded by the wings of other creatures. 147. 6 S S -K ^ 1 G O J3 5 M o S S 1 5 Id TS Il a; ••r^ 1 tn S •t-t M cn O CO -4.J S -w Ui « h (i> w 8 § u H 93 92 ^ ^ -tj o -^^ -O ^ a -j:; m $ enfr-i ixo 9J .c ^ en SH Ml W O -4-> z ^ IH R fe o f—« ^ cr M ^ . 2 -♦-» tn o 1 aS o to w . 2J o a> +J IH itn S* 149 CHAPTER II The First Bird And let Fowl fly above the earth ; with wingsDisplayed in the open firmament of heaven. Milton. The ancestors of birds—^The first known bird and its many remarkablefeatures—^The gradual evolution of the birds of to-day. SOONER or later all bird-lovers find themselves ponderingover the problem of the origin of birds : how theyevolved their pecuUar covering of feathers : what was thefashion of the original arm and hand out of which the wingwas fashioned : and finally, whence have the birds beenderived ? Since these pages are avowedly devoted to the subject ofFhght, any attempt to summarize the state of our knowledgeon these aspects of the hi
