140 



iemployed as a setting for rings. The precipitates, especially 

 those from acid of sugar, may be employed as water colours; 

 that, by acid of galls, affording a good tilp red, and thiit, 

 with Prussian alkali, an agreeable dark green. The latter, 

 also, communicates a durable colour to silk, as my friend, 

 Lampadius, assures me; perhaps, Avith proper managemf^nt, 

 it might be employed to furnish the so much wished for dura- 

 ble green for the printing of cotton. Aud, lastly,, its close 

 ■connection with some iron ores, and those exactly of the 

 most superior quality, such as the ores of Norway and Stiria, 

 leads naturally to the suspicion, that it may possess some 

 favourable influence upon the manufacture of iron, and, 

 therefore, well deserves the attention of future inquii-ers.- 

 Such are the principal circumstances, at present known, 

 respecting this genus of fossils; time will, doubtless, hero, 

 as usual, find much to amend, to correct, and to supply. 



XL 



On the Cultivation of Grapes. By Geo. Cumberland, Esq. 



To Mr. Nicholson. 

 Sib, jB?7,i/o/, Jrt«. is, 1807. 



Useful Instruc JPeRCEIVING that practicable improvements in all the 

 tions forde- ^ ^ . ^ e 



fending grapes, arts that benefit existence are sure to meet with a favour- 

 and giving ^\y\(. reception in your Journal, I trust you will accejit the 

 vantages^ of' foIloAving account of some practices that have latel) been 

 sunshine, and successful in the management of fruit trees, particularly th»? 



S &c.°' ^ ^^"^ °" *^^ exposed wall. 



Having last year come into possession of some south walls 

 • covered with vines that were said not aiways to ripen so well 

 as might be expected, I was advised to cover them with glass, 

 as the only sure means of securing a very considerable pro- 

 duce; but as that mode M'as too expensive to suit my cir- 

 cumstances, I resolved to make trial of less costly expe- 

 dients, and at first turned my thoughts to those bell-glasses 

 blown with a hole in the back, into Avhich the young 

 bunches are introduced very early so as to expand within the 

 glass, and when ripe are severed at the stalk, and delivered 

 at the wider aperture. 



The 



