18 G 
duced to believe that it is owing to the early 
sowing that Carrots are destroyed by the Worm 
in light early soils.” 
Macray, in the above Memoirs, states, that 
he sows Carrots on ground where Artichokes 
has stood a few years j and in order to accomplish 
that object, 23lants annually a succession of Arti- 
chokes, on which plants he says “ those vermin 
annot subsist, they soon perish, and the ground 
where the rows stood has all the advantage of a 
new soil.” 
Smith has scarcely made his communications 
sufficiently clear in I'espect to the manner in which 
the manure should be applied. If he digs it into 
the ground, it can neither prevent the parent from 
laying her eggs, nor destroy or prevent the larvae 
from feeding, as they always perforate and bury 
themselves in the Carrot, and thei’efore the manure 
camiot have sufficient power to destroy or banish 
them while protected in their cells, as we find 
them very tenacious of life, even when unpro- 
tected and immersed in a solution possessed of 
much more powerful destroying properties. It is 
more jirobable that the manure is of service, if 
laid on the surface, and only worked among the 
earth with a fork or garden harrow ; as by laying 
it upon the sm'face, it may prevent the parent 
choosing such situations to establish her jirogeny. 
^ Henderson’s plan of sowing late does not 
strike me as being at all useful, but I should ra- 
ther say the contrary 3 for, by the Carrot being 
