. Philosophical transactions. foluble impurities of the llrata, through which theytranfuded. Since the above-related experiment was made, I have readwith pleafure the ingenious account of the Kings wells atSheernefs, in the laft volume of the Tranfadions, by SirThomas Hyde Page, in which the water rofe three hundredfeet above its fource in the well ; and have alfo been informed,that in the town of Richmond, in Surrey, and at Infhlp nearFrefton in Lancafhire, it is ufual to bore for water througha lower flratum of earth to a certain depth ; and that when it is an artificial Spring of Water, y-
. Philosophical transactions. foluble impurities of the llrata, through which theytranfuded. Since the above-related experiment was made, I have readwith pleafure the ingenious account of the Kings wells atSheernefs, in the laft volume of the Tranfadions, by SirThomas Hyde Page, in which the water rofe three hundredfeet above its fource in the well ; and have alfo been informed,that in the town of Richmond, in Surrey, and at Infhlp nearFrefton in Lancafhire, it is ufual to bore for water througha lower flratum of earth to a certain depth ; and that when it is an artificial Spring of Water, y- is found at both thofe places, it riles fo high as to overflow thefurface of the well: all thefe fa6ls contribute to eftabliili thetheory above-mentioned. And tliere is reafon to conclude,that if fimilar experiments were made, artificial fprings,rifing above ground, might in many places be thus producedat fmall expence, both for the common purpofes of life,and for the great improvement of lands by occafionally water-ing [ 8 ] Ti. An -Acmmt of an Englifli Bird of the Genus Motacilla, fuppofd to be hitherto tmnotked by Britifh OrnlthrAogijls ; ohfervsd by the Rev. John Lighttbot, M. A. F. R. S. In. a. Letter to Sir Joieph Banks, Bart. P. R. S. -^ ^ Rejid November 18, i}-84. S I R, Uxbridge, Nov. 20, 1783. AS every difcovery In natural hiftory is efleemed worthy thenotice of that Society which was inftituted on purpofe toiniprove natural knowledge, I have taken the liberty to fendyou a defcription and drawing of a bird which haunts thereeds of the river Coin, in the neighbourhood of Uxbridge,and which feems to have hitherto efcaped the notice of writerson Britifli Ornitiiology; and therefore fome account and de-fcription of it will not, I trud, be unacceptable to the Societyover which you fo laudably prefide. The neft and eggs of the bird I am about to defcribe firftattra£ted my attention, and led to the difcovery of the birditfelf. They were repeatedly brought by a fifher
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