706 PHILOSOPHICAL TRANSACTIONS. [aNNO 1763. 



a full sun, yet, I presume from a chilliness in the air, did not revive to be able 

 to fly. 



Remarks by Mr. Collinson. — What I collect from this gentleman's relation is, 

 that it was the practice of the boys, annually to take these birds, by their appa- 

 ratus and ready method of doing it ; and the frequency of it was no remarkable 

 thing to the watermen. Next it confirmed my former sentiments, that some of 

 this swallow-tribe go away, and some stay behind in these dormitories all the 

 winter. If my friend had been particular as to the species, it would have 

 settled that point. 



XXV. The Properties of the Mechanic Powers Demonstrated ; with some Ob- 

 servations on the Methods that have been commonly used for that Purpose, 

 By Hugh Hamilton* D.D., F.R.S. p. 103. 



This paper may be read with more advantage in an improved edition of it 

 given in this author's ingenious volume of Philosophical Essays, the 3d edition 

 of which was published in the year 1772. 



XXVI. On some Subterraneous Apartments, with Etruscan Inscriptions and 

 Paintings, discovered at Civita Turchino in Italy. By Joseph fVilcox, Esq. 

 F.S.J, p. 127. 



Civita Turchino, about 3 miles to the north of Corneto, is a hill of an ob- 

 long form, the summit of which is almost one continued plain. From the 

 quantities of medals, intaglios, fragments of inscriptions, &c. that are occa- 

 sionally found here, this is believed to be the very spot, where the powerful and 

 most ancient city of Tarquinii once stood ; though at present it is only one 

 continued field of corn. On the south-east side of it nms the ridge of a hill, 

 which unites it to Corneto. This ridge is at least 3 or 4 miles in length, and 

 almost entirely covered by several hundreds of artificial hillocks, called by the 

 inhabitants Monti Rossi. About twelve of these hillocks have at different 

 times been opened ; and in every one of them have been found several subter- 



• Dr. Hamilton was born in 1728, and died Dec. 1, J805i consequently ai 77 years of age. 

 He was educated at Trinity College, Dublin, where he obtained a fellowship, and was professor of 

 Natural Philosophy. He afterwards received promotion in the church : first as dean of Armagh j 

 then in Jan. 1796 he was elected bishop of Clonfert ■. and 3 years after he was translated to the see 

 of Ossory ; being preferred to those dignities, without solicitation, from his high character for 

 piety, learning, and attention to the duties of his profession. His writings, too, in several 

 branches of science, entitle him to rank among the highest ornaments of the university of which he 

 was a member. The above is his only communication in the Philos. Trans. His other scientific 

 publications, are the Philosophical Essays, above-mentioned ; and a treatise on Conic Sections, in 

 4lo. 1758 } being probably the most elegant work ever produced on that subject. 



