Mvtmokgkal Ohfervathhi made at Padua: 4^7 



remarks, replied, that they were not birds of patr;ige; and 

 the caufe of their fudden diiappearance, but irregular return, 

 was, they had a fixed day for immerging in the water, but 

 none for emergin- from it. On my doubting his hypothefi., 

 he told nie, that as a neighbour of his, not long beiorc, was 

 dvainuiir a pond, on a warm day, near the feafou of the year 

 in which the fwallows firft appear, his attention was attraded 

 byobferving the mud, which, in confequence of draining 

 the Dond, had for fome time been expofed to the fun, move 

 and 'appear animated; he then ordered a quantity of this 

 mud to be conveyed into a room in his houfe, which he 

 caufed to be gradually warmed by a flow fire. From this 

 mud there foonaroie a number of fwallows, hovering over 

 himfelf and family, who had been fpeftators of their refur- 



reSion. 



Thefe few obfervations, however Imperfeft, may poflibly 

 afford a large field for [peculation to the philofophic mmd, 

 and lead to ufeful difcovtries. For my own part, I am now 

 become a profelyte to the dodrine of the fwallow's remain- 

 ing in a torpid ilale during the winter, not only from fpe- 

 cutative refearches, but from ocular demonftralion *. 



XVIII Meteorological Ohfervations made at Padua in the 

 Month of June 17^3, lotth a DiJJirlation on the extra- 

 ordinary Fog which prevailed about that Time. Bj M. 



TuALUO i . 



iJAROMETER.— its grcateft elevation was on the 24t}« 

 and 25th of the month, viz. 28 inches 4 hnes; its greatclt 

 depreflion on the l6th, ay inches 4 Imes. In the lummer 

 months there is generally very Httle variation m the baro- 

 • Ponnant. in his B.icilh Zo< lo,y. Vol. I. p. 4-4. f-ls .lifpoica to Imilc 

 at the accounts given bv OL'- M-iS"^^' D-^>=""' ^"'^ ^'^'"' '^^ '^^ '"''■ 

 n-crfion of iwallows. Ut .he phyf.olog.ft and anato.n.ft rc.lon on the 

 nu.tter as they may, there items to l^e pofuivc evidence of the fad. t. 

 f (-rom tho Jourr.^i .«' F'^vM"*- 



YoL.lV. K« ""-•^'^^' 



