255 
J. S. Seoars, in a treatise upon this subject, 
says that, “ the Mildew is of a very shai’p corrosive 
nature, and by its acrimony hinders the circulation 
of the nutritious sap, in consequence of which the 
leaves begin to fade, and the blossom and fruit are 
greatly injured. I have observed that, contrary to 
the common opinion, trees are more liable to Mil- 
dew on south and east walls. When they have per- 
fectly recovered, whenever you apprehend danger 
wash or sprinkle the ti’ees well with urine and 
lime-water, and when the young and tender shoots 
are much infested, it will be necessary to wash 
them well with a woollen cloth, dipped in the fol- 
lowing mixture, so as to clean them of all the 
glutinous matter, that their respiration and perspi- 
ration may not be obstructed.” 
This Recipe is the same, or nearly so, as that 
laid down by Forsyth, who most probably was the 
inventor. “ Take tobacco one pound, sulphur two 
pounds, unslacked lime one peck, and about one 
pound of Elder buds ; pour on the above ingre- 
dients ten gallons of boiling water, cover it close, 
and let it stand till cold, then add as much cold 
water as will fill a hogshead. It should stand two 
or three days to settle, then take off the scum, and 
it is fit for use.” 
Although I have spared no pains fully to com- 
prehend this mysterious disease, its cause appears 
to me yet undiscovered. My investigation leaves 
me quite decided that it is not produced from an 
insect, an opinion which has so long existed. Cer- 
