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or any of those many intermediate Places over which some of them probably 6y.

And lastly, to all this, let us briefly add the Accommodations these Birds of Paffage have, to en* able them to take such long Flights, viz. the Length of their Wings, or their more than ordinary Strength (f) for Flight. , -.t\:c/A iw

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merata majfa, qua or* ad os, ejr al.i ad alum, c fede ad ptdettf f»st principMtn autitmni fefe inter cannot descenfum codigArunt.

'Maj]a autem Ma per imperitos adolefcentes ixtracia,

atque in tfluaria partata, caloris accejsu Hirttndwes resolute, volare quidem incipiunt, jed exiguo terns ore durant. OL Mag. Hist. L. 19. c. 10.

Since my penning this Note, we had, at a Meeriij^of the* Royal-Society, Feb. it. 1711-13. a farther Confirmation of Swallows retiring under Water in Winter, stern Pr. Colau a. Person very curious in these Matters; who speaking of their Way of Fishing in the northern Parts, by breaking Holes* tnd drawing their Nets under the Ice, faith, that he Taw sixteen Swallows so drawn out of the Lake of Samrtit, and about Thirty out of the King's great Pond in Rofineilen; and that at Schlebitten, near an House of the Earl of Dohna, he saw two Swallows just come out of the Waters, that could scarce stand, being very wet and weak, with their Wings hanging on the Ground: And that he hath observ'd the Swallows to be often weak for some Days after their Appeafah.ce.

■ («) As Swallovis are well accommodated for long Flights, Ky their long Wings, so are Quails by the Strength of their petloral Mufcks, by the Breadth of their Wings, vc For Quails have but short Wings for the Weight "ttf their Body j and yet .they fly from us into warmer Parts, against Winter, and to us in Spiing, crossing our Seas. So divers Traveller* tell us they cross the Mediterranean twice a Year, flying from Europe to Africa, and back again: Thus Belloniut in Mr. Willughby, faith, When we fail'd from Rhodes to Alexandria of Ægypt, many Quails flying from the North towards'the South, where taken in our Ship; whence 1 am verily persuaded, that they jbift Places: For formerly also, when I fail'd tut of the isle c/Zant to iVrorea, or Negropont, in the'Spring Time, I had obserif d Quails flying the contrary Wayy front South to North, that they might abide there all Summer.Ci'At

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. ^, g H A F. IV.

Of the Incubation of Birds.

ANother Thing relating to the State of this Tribe of Animals, is their Incubation. And first, the Egg it self deserves our Notice. Its Parts within, and its crusty Coat without, are admirably well fitted for the Business of Incubation. That there should be one Part provided for the Formation of the Body (a), before its Exit into the World, and another for its Nourishment, after it is come into the World, till the Bird is able to shift for, and help it self j and that these Parts should be so accurately brae'd, and kept ist due Place (£), is certainly a design'd, as well as curious Piece of Workmanship.

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(a) The Chicken is form'd out of, and nourish'd by the Whit* alone, till it it grown great. The Yolk serves for the Chicken's Nourishment, after it is well grown, and partly also after it it hatch'd. For a good Part of the Yolk remains after Exclusion, being receiv'd into the Chicken's Belly; and being there reserv'd, its in a Store-house, » by the [Appendicula, or Ductus intestinalis,] as by a Funnel, convey d into the Guts, and serves instead of Milk, &c. Willugh. Ornith. L. I. c. 3. lpsum animal ex albo liquore Ovi corforatur. Cibm ejus in lutco est. Plin. L. 10. C. 53.

uiristotlc faith, The long fliarp Eggs bring Females; the round tnes, wish a larger Compass at the fiarper End, Males. Hist. An. L. 6. c. 1. After which, he tells of a Sott at Syracuse, that fate drinking so long, till Eggs were hatch'd; as also of the Custom of Ægypt, of hatching Eggs in Dunghills.

(b) As the Shell and Skin keep the Yolk and two Whites together; Ib each of the.Parts, (the Yolk and inner White at least,) are separated by Membranes, involving them. At each End of the Egg is a.Treddle, so cajl'd, because it was $.:A HO i formerly

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