""4. 



kk 



■•4 



='nL 



'0 . c. 





as 



^vls 



'^M 



wi 



Q 



^ 



^ca 



^a3 



*** 



Wi 



life ^ ^ 



tended 

 Fothe 



r 



cv. 



pia..:, 







ight. 



' ve^e- 



W 



fepro- 



ilalks 

 .; their 



ling 



a 



-cale 



) 



-:ale is 



drill-S 

 in 



S£CT.XIV. 2.5. 



OF PLANTS. 



535 



winter it (hould be covered up 



It rauH: be kept dry, th 



IS, 



th 



c 



beds n^ade in the dried ground ; it is not fit to be eaten till the third 



y 



ft 



ye red up in 



may be kept from p 



it is fovved. The year before it is eaten it mud be 

 the beo-imiino; of winter, firfl with ftable 



• 



It 



d 



few {licks placed lik 



w 



hich. 



ach root ; then with long litter two or three feet 



hig 



h 



th 



higher the better, beeaufc the more it is forced, the earlier it is fit 



be gathered, and the whit 

 the beoinning of January 



be 



It is to be gathered about 



d fo on till May, one bed being kept 



ud 



o 



nother. It fhould be boiled and fent up on tOc 

 d is an excellent vegetable, and at an early feafo 



ft like afp 



5 



Th 



th, on which vegetables infert th 



fometimes 



prefents noxious materials to their abforbent fyflem, as the acidity of 



fome clays 



1 



hich when the roots of fome fruit trees penetrate 



thev are faid to 



fe their health 



mentioned in Sed. II. 9. by 



w 



the death or decay or their root-fibres. 



Pure filiceous fands alfo prevent vegetation from their contain] 

 no carbonaceous matter, and by their fo readily permitting the de 

 and rains to exhale from them, efpecially in hotter climates, wh 

 they conftitute a moving furface unfriendly to all organized life. 



6. There are alfo noxious exhalations difFufed in the atmofphere 

 the neighbourhood of fome manufaaories ; which are faid to inj 



\ 



iD 



fu 



th or deflroy the life of vegetables ; as the fmoke from the 

 in which lead is fmelted from the ore, from potteries, and 



from lime-kilns ; to which may be added the marine fait 

 acid, which abounds in the too great vicinity of the fea. 



T 



thefe belong the experiments 



of D 



Pefeh 



f Geneva 



9 



acid, of 



who immerfed feveral plants in vapours of nitrous 

 alkali, and of ether, to the great injury or death of the plants. Jour- 

 nal de Phyfique par Delametherie, T. ii. p. 345« 



7. Unwholefome or poifonous materials may be applied to vegeta- 

 bles fo as to difeafe or deftroy them ; as their abforbent fyftems like 



thofe. 



^ 

 t 



