DESULPHURATION OF METALS. 197 



extend tlieiv branches in every direction, in whjch they do 

 not injuriously interfere with each other; and the soil should ^^J^ ^^^ ^^ 

 just be sufficiently rich to promote a moderate degree of 

 growth, without stimulating the plant to preternatural exer- 

 tion, which always induces dieease*. The periods which 

 different kinds of fruit trees require to attain the age of pu- 

 berty, admits of much variation. The pear requires from AgeofbeaP"* 

 twelve to eighteen years; the apple, from five to twelve, or 

 thirteen ;^e plumb and cherry, four or five years; the vine, 

 three or four; and the raspberrj^ two years. The straw- 

 berry, if its seeds be sown early, affords an abundant crop 

 in the succeeding year. My garden at present contains se- 

 veral new and excellent varieties of this fruit, some of which 

 I should be happy to send to the Horticialtural Society, but 

 the distance renders it impracticable f. 



yi. 



Memoir on the Desulphurallon of Metals: by Mr, GuENl- 

 VEAU, Engineer of Mmes%» 



■MONG the great number of metallic sulphurets, with Decomposi- 



which Nature presents us, the decomposition of many is of *'^" ^^ native 

 , . -1 rm 1 1 r. • sulphurets im^ 



much importance in the arts. 1 he sulphurets oi iron, cop- portant. 



per, lead, and mercury, and some others, give rise to raetai- 



lurgical processes, that particularly claim the attention of 



those, who are addicted to the study of chemistry. The The facts of 



nature and pro^terties of these have been well known, since have-not been 



cliemistry has made them an object of her labours : but as compared with 



the facts collected in laboratories have never b/een carefully smeUia<^ housa 



• The soil of -an old garden is peculiarly destructive. 



-f Jhe hautboy strawberry does no; appear to propagate readily with Hautboy, 

 tte other varieties, and may possibly belong to an originally distinct spe- 

 pies. I have, however, obtained several offspring from its farina; but 

 they have all produced a fteble and abortive blossom. If nature, in any 

 instance, permits the existence of vegetable mules (but this I am n<jt 

 inclined to believe) these plants seem to be beings of that kind. 



X Journal des Mines, No. 121, -p. a. 



compared 



