\ 



496 



PRODUCTION OF 



\ 



Sect. XVII. 3. 7 



'X 



fift of the cauclexes of buds, or the coniieaing veffels between the 

 plumules and the radicles of them, is performed by foaking them fome 



eeks in (lagnant water 



the mucous membranes, which 



nea thefe fibres, are deftrojed by putrefaaion ; and afterwards by 

 dryino them, and beating off with hammers, what may ftill adh 



fac 



. ; 



I 

 t 



Thefe fibrous parts of the barks of trees, as they 

 charine matter, like the alburnum, are much lefs liable to decay than 

 the fap-wood, or perhaps than any part of the timber. Mauper- 

 tuis, who^went to Lapland to meafure a degree of the meridian, fays, 

 that among the numerous trees which lay upon the ground d^ftroy- 

 ed by age, or blown down by the winds, many birch trees appeared 

 whole, owing to the undecayed ftate of their bark ; but crumbled 

 into powder on being trod upon; and that the Swedes took the prac- 

 tice from this of covering their houfes with this unperifliable bark, 



on 



which they fometimes lay foil 



d th 



pofTefs aerial gard 



Voyages by Mavor, Vol. XII. 



■7. To increafe the quantity of bark it muft be remembered, that 

 the leaf-buds, or viviparous ofi^spring of trees, as they form new buds, 

 acquire new caudexes extending down into the ground, and thus in- 

 creafe the bark of the ftem in thicknefs ; but the flower buds acquire 

 no new caudexes, but die, as foon as they have ripened th 

 and confequently do not increafe the .thicknefs of the bark. 



feed 



Wh 



method of increafing the quantity of the bark 



to 



feth 



number or vigour of the leaf-buds in contradiftinaion to the flower- 

 buds, which may be done by pinching off the flowers as foon as they 

 appear; and as the bark becomes gradually changed into wood, this 

 may be one method alfo of forwarding the growth of timber trees, as 



mentioned in the next Seaion. 



8. The method of preferving the bark of trees from mofs confifts 

 in rubbing off that parafite vegetable in wet weather by means of a 

 har^ifh bruih ; which is faid to be ufed with advantage on the apple- 



the cyd 



d may at the fame time give motion 



to 



