X ] 
the black powder, when mixed with - the 
seed, but from the visitation of certain inse6ls 
peculiar to particular seasons, which feed 
upon the ears of the wheat about the time 
the grain is forming. We have long been 
of the same opinion, and that any other 
powder, mixed with wheat, would be as likely 
to convey animalcula or destroy the succeed- 
ing crop. Sir John has left us nothing to 
add upon this subjedl. We are pleased with 
his remarks upon the atmospheric nourish- 
ment of plants, which may be in part eluci- 
dated by laying an onion upon a dry oak or 
maliogany table, in the spring season, a situa- 
tion of all others where it would be unlikely 
to gain any nourisliment from below. If he 
weighs it after it has been there a given 
time, say ten days, he will find a great and 
progressive accumulation of weight, which 
must alone be derived from the atmo- 
sphere. 
We observe the account of Mr. Bonn's 
mode of keeping a farmer's ledger. It con- 
sists of seventeen pages ; and we beg leave 
