Receipts for Enamel Colours, ^c 263 



■whole of those ckiinps on Hounslow heath, where the tree-, are 

 not destroyed, but grow so as to slieltcr each otlier, and ni that 

 other cluuip on the'higli ground south of tlie same road, between 

 Egham and Virginia Water ; aUhongh the trees are all young, 

 tliere are several feet difference in tlie height between those on 

 the north and those on the soutti side of the same clumps. 



lience it is inferred, that no speties of the tir tree will arrive 

 at such perfection in our country, on account ot 5ts high and 

 rcind change of temperature, as 'in tiie higher latitudes. 



Yet nature is bountiful in providing for all ; as the reverse 

 of this is the case with the oak tree. 



XLV. Rectipis for E?icimel Colours, and for staining and gilding 

 Glass. Bij Mr. 11. \Vynn.* 



SiR, — The liberality of the Society in encouraging and re- 

 warding communications in every useful art, induces me to offer 

 to their notice a concise and complete method of composing 

 enamel colours. Painting in enamel colours has always been 

 considered very interesting, and one of the most costly pro- 

 ductions of art in every country where practised : but the real 

 preparation of the colours has always been confined to the know- 

 ledge of a few persons who have made a mystery of it, and what- 

 ever has been yet published on the subject, appears to be chiefly 

 the compilation of writers unskilled in the profession. Many 

 artists of superior talents, in different parts of this country, could 

 practise the art but for the difficulty of procuring a complete set 

 of good colours: indeed it is extraordinary with what suspicious 

 secrecy the art of making the proper enamel colours has hitherto 

 been "conducted. I have been acquainted with several of the 

 best manufacturers, whose colours were used by the most emi- 

 nent painters on the finest and most elaborate works of the time, 

 who have died without ever benefiling their country by publish- 

 ing their ac(iuirements, or leaving any documents behind them. 

 By a continued perseverance in such secrecy, it is not impossible 

 tliat the present improved state of knowledge in the art might, 

 under unfavourable circumstances, he entirely lost, if some ex- 

 perienced professional person did not seek for an opportunity of 

 making it public, and more generally useful. With these mo- 

 tives I take the liberty to offer the accompanying treatjse, which 



• From the Traiisaitloitx of the Societij for the Encouragement of Arts^ 

 Mduufavtures, and Cummcrcc, for 1817- Twenty guineas were voted to 

 .Mr. Wynn, by the Society, fov this cominunicatioii. 



K 4' consists 



