$fr; marsham’s further Account of the 
aggregate' of three Oaks planted the fame year ( viz. all I mea- 
fured). amounted to but one inch yearly to each tree. In 1 779 
B wafned another Beech of the fame age, and the Increafe in 
•1780 was 'three inches, when the aggregate of fifteen unwafhed 
Beeches was not full fifteen inches and fix-tenths, or not one 
.inch and half a tenth to each tree; yet moft of thefe trees 
.grew on better land than that which was wafhed. But I appre- 
hend the whole of the extraordinary increafe in the two laft 
experiments fhould not be attributed to wafhing : for in the 
autumn of 1778 I had greafy pond-mud fpread round fome 
favourite trees, as far as I fuppofed their roots extended, and 
although feme trees did not fhow to have received any benefit 
from the mud, yet others did, that is, an Oak increafed half an 
inch, and a Beech three-tenths, above their ordinary growth. 
Now though the Beech gained but three-tenths, yet, perhaps, 
that may not be enough to allow for the mud ; for the fummer 
of 17.79 was the moft ungenial to the growth of trees of any 
fince I have meafured them, feme not gaining half their ordi- 
nary growth, and the aggregate increafe of all the unwafhed 
and unmudded trees that I meafured (ninety-three in number of 
various kinds) was in 1779 but fix feet five inches and feven 
tenths, or feventy*feven inches and feven-tenths, which gives 
but eight-tenths and about one-third to each tree; when 
in 1778 (a very dry fummer in Norfolk) they increafed 
ieven feet and nine-tenths, or near eighty-five inches, which 
gives above nine-tenths to each trSfe : and this fummer of 
1780 being alfo very dry, yet the aggregate increafe was 
above half an inch more than in 1778. But the beft in- 
creafe of thefe three years is low, as there are but twenty of 
the ninety-three trees that were not planted by me, and 
greater increafe is reafcnably expe&ed in young than old trees ; 
4 yet 
