360 SENSIBLE TESTS OF CERTAIN ACIDS AND AMMONIA. 



months after it was made. Some excellent and generous 

 wines may stand on the lees three or four years ; but they 

 should be kept in barrels that will hold eight or ten hogsi 

 heads, when the wine will feed, and be the better for it. 



Keeps from six Good red champagne will keep in bottle six, eight, ten, or 



to twelve years. twe lve years. 



Management of In some places, the vines are suffered to grow much 



tali vines. higher than in others, or to about five feet, but this is 



adapted only to a strong and vigorous soil. For this pur- 

 pose the strongest shoot of the vine is taken, all the rest 

 being cut off, and all the lateral shoots. This is bent 

 round in a complete circle quite to the stock, at the time 

 when the sap is most abundant, and the buds already open- 

 ed ; and supported by an oaken prop six feet high, and an 

 inch square, to which it is fastened in two or three places. 



Laying down. Vines of this kind are propagated by laying down the old 

 stocks every tea or fifteen years, in a small long trench ; 

 leaving on them three or four branches, which are likewise 

 buried in the ground. These will produce good plants for 

 the following year. 



Produce greater The produce of these vines is greater, but the grapes do. 

 u not so goor . not r jp en so eariy^ an a the wine in consequence is not quit* 

 so fine and exquisite. 



X. 



On the most sensible Reagents for Muriatic, Carbonic, and 

 Sulphuric Acids, and for Ammonia : by C. H. Pfaff, 

 Professor of Chemistry at Kiel *. ; 



In 



Sensible test of IN the inquiry concerning the pretended formation of 



muriatic ; 



desirable. 



muriatic acid in water, by means of the galvanic pile, it is 



unquestionably of great importance, to possess a very sensi- 

 ble test of this acid, that we may discover the first traces of 

 Nitrateofsilver.it, and pursue its successive increase. Hitherto the nitrate 

 of silver has generally been employed. This reagent is no 

 doubt very sensible to this acid. Kirwan asserts, that one 

 part of the acid diluted with 108333 of water may be de- 



* Annates de Chimie, vol. lxii, p. 19, April, 1807. 



tected 



