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XXIX, A further Account oj the Ufefulnefs of wajhtng the 
Stems of Trees. By Mr, Robert Marfham, of Stratton, 
F. R. S. 
Read May 31, 1781. 
T HE following account is a kind of poftfcript tp my 
letter to Dr. moss, Lord Bifhop of Bath and Wells, in 
1 775, which the Royal Society did me the honour to publifh 
in the Philofophical Tranfaftions in 1777* In that I (hewed 
how much a Beech Increafed upon its ftem being cleaned and 
wafhed * ; and in this I (hall (hew, that the benefit of cleaning 
the ftem continues feveral years : for the Beech which I wafhed 
in 1775 has increafed in the five years fince the walhing eight 
inches and fix-tenths, or above an inch' "and feven-tenths yearly ; 
and the aggregate of nine unwafhed Beeches of the fame age 
does not amount to one inch and three-tenths yearly to each 
tree. In 1776 I wafhed another Beech (of the fame age, viz. 
feed in 1741) ; and the increafe in four years fince the wafhing 
is nine inches and two-tenths, or two inches and three-tenths 
yearly, when the aggregate of nine unwafhed Beeches amounted 
to but one inch and three-tenths and a half. In 1776 I wafhed 
an Oak which I planted in 1720, which has increafed in the 
four years fince wafhing feven inches and two-tenths, and the 
* Vide Phil. Tranf. vol* LXVII. for the ye« ir 1777, parti, p. 12. 
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