. L'uccello, la sua forma e funzione . ; orbita molto grande e capacitiva del cervello-caso, mostrando grande avanceoltre la condizione di rettilian. un cranio che non ottiene mai oltre questa condizione. E' il caso che il sipario dell'eternità fosse stato, per un momento, un'idea per noi e un'idea data nel passato un pascolo remoto e offuscato che le nostre ricerche più intense sembrano rivelare, ma deboli, forme scheletriche di forme strane, whichyet che sappiamo deve essere mescolato e impercettiblyfused, attraverso milioni di anni, nella vita attuale della terra. Guardando il cranio dei polli nel suo complesso, notiamo un numero di usi che la v

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. The bird, its form and function . ; orbit very large and brain-case capacious, showing great advancebeyond reptilian condition. a skull which never gets beyond this condition. It isas if the curtain of eternity had been, for a moment, drawnaside for us, and a glimpse given into the past—a pastso remote and clouded that our keenest searches seemto reveal but dim, skeletal forms of weird shapes, whichyet we know must have blended and imperceptiblymerged, through millions of years, into the present lifeof the earth. Looking at the chickens skull as a whole, we noticea number of uses which the various parts serve. The The Skull 107 large rounded portion taking up most of the skull properis, of course, the box of bone which protects the brain.On each side, a large cavity shows where the eyes areplaced, and if we compare this skull with that of a cator dog or with that of a human being, we will see whatgreat importance eyes must be to a bird; the cavitiesfor them are so much larger than in other animals. Back u/>. Occ.. Fig. 83.—Skull of Fowl, showing orbit, brain-case, ear, lower jaw, premaxillary(Pmx.), maxillary (Mi.), vomer (Vo.), lacrymal (Lc), jugal (Ju.), palatine(Pal.), pterygoid (.Ptg), quadrate (Qd.), and supra (Sup. occ), ex (Ex.occ), and basioccipital bones. (After Parker.) of each eye-case we see an irregular opening, the portalof the ear; and in front of the brain two apertures in thebeak open toward the organ of the nose. The prominentbeak and wide-spreading lower jaw are chiefly concernedin the procuring of food. We need not bother with thenames of all the bones, but there are some too interest-ing and with too strange a history to be passed by. Let us glance at the back of the skull for a moment.Here we find a large round opening through which the 108 The Bird spinal chord passes into the brain, and below it is asmall knob, which in the living bird fitted into the firstvertebra of the neck. It is a very tiny projection ofbone, but fraught with si

Parole chiave associate all'immagine

• bookcentury1900
• bookdecade1900
• booksubjectbirds
• bookyear1906