204A Recipe for driving Insects from Trees. 
than the Calisaya,” should read thus, as it stands in my 
original manuscript, (the error having been made in trans- 
scribing,) ‘Experiments which I made upon the Cartha- 
gena bark, of rather better quality than the market generally 
produces, yielded one twellth the quantity of quinine pra~ 
duced by the Calisaya arrolenda.” 
5. Quere—Indtan Summer. 
To tHe Epiror, 
Will you please to insert in the next number of your Jour- 
nal, the probable causes of the peculiar aspect of the sky du- 
ring that portion of the month of November, commonly call- 
ed “Indian Summer?” ‘The only object sought for by this 
question is information ; by publishing an answer to which 
you would oblige, 
Sir, 
A CONSTANT READER. 
Gishkill, May 21, 1825. 
The above inquiry suggests a fair topic of discussion, up- 
on which we should be willing to receive a communication. 
EnrrTor. 
6. Recipe for driving Insects from trees—communicated. 
—Bore a hole into the trunk of the tree, as far as, or into, the 
heart, fill this hole with sulphur, and place in it a well fitted 
plug. A tree of from four to eight inches in diameter re- 
quires a hole large enough to admit the little finger, and in 
the same proportion for other and larger or smaller trees. 
This will usually drive the insects away in the course of for- 
ty-eight hours, but uniformly succeeds, perhaps sometimes 
after a longer time. These facts were mentioned to me by 
the Rev. Dr. Woodhull. He stated that a fine large shade 
tree in Albany, was so infested with worms and caterpillars 
that passers by were obliged to make a circuit to avoid it; it 
became so much of a nuisance that they were on the point of 
cutting it down, when the application of this experiment in 
forty-eight hours entirely cleared it of the insects. Col. 
Rutgers, of New-York, has tried this experiment with (I 
think) uniform success ; and in several instances, fruit-trees 
which were almost lifeless were restored. . 
B. Due: 
