THE ROSE SAW-FLY. 
527 
Having finished their transformations, and turned to flies, 
within their cells, they come out of the ground early in Au- 
gust, and lay their eggs for a second brood of young. These, 
in turn, perform their appointed work of destruction in the 
autumn ; they then go into the ground, make their earthen 
cells, remain therein throughout the winter, and appear, in 
the winged form, in the following spring and summer. 
During several years past, these pernicious vermin have 
infested the rose-bushes in the vicinity of Boston, and have 
proved so injurious to them as to have excited the attention 
of the. Massachusetts Horticultural Society, by whom a pre- 
mium of one hundred dollars for the most successful mode 
of destroying these insects was offered, in the summer of 
1840. In the year 1832, I first observed them in gardens 
in Cambridge, and then made myself acquainted with their 
transformations. At that time they had not reached Milton, 
my former place of residence, and they did not appear in 
that place till six or seven years later. They now seem 
to he gradually extending in all directions, and an effectual 
method for preserving our roses from their attacks has be- 
come very desirable to all persons who set any value on 
this beautiful ornament of our gardens and shrubberies. 
Showering or syringing the bushes with a liquor made by 
mixing with water the juice expressed from tobacco by 
tobacconists, has been recommended ; but some caution is 
necessary in making this mixture of a proper strength, for 
if too strong it is injurious to plants ; and the experiment 
does not seem, as yet, to have been conducted with sufficient 
care to insure safety and success. Dusting lime over the 
plants when wet with dew has been tried, and found of 
some use ; but this and all other remedies will probably 
yield in efficacy to Mr. Haggerston’s mixture of whale-oil 
soap and water, in the proportion of two pounds of the soap 
to fifteen gallons of water. 
Particular directions, drawn up by Mr. Haggerston him- 
self, for the preparation and use of this simple and cheap 
