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 be 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 



