[ 462 ] 42 



so roimfl and .smootli that tliey could not be fairly attributed to any 

 other source than to some species of Chalcis ; but as they were a little 

 larger than the holes made by the minute species with which we were 

 exi)erimenting, we were unable to arrive at a definite conclusion. 



On the loth of July, I ^isited Galena, and in comi)any with Captain 

 Beebe, submitted one of the trees, to which the greatest number of the 

 twigs had been attached, to a thorough examination. 



The result, if not actually conclusive, was at least extremely encoura- 

 ging. We detected a considerable number of boles in the scales, which 

 appeared to be identical, in every respect, with those made by the Chal- 

 cis in question, and in one instance we discovered three of these holes 

 ujion the same twig, within a space of four inches. 



In conducting an experiment of so delicate a nature I am well aware 

 that the greatest caution must be exercised to avoid jumping to hasty 

 conclusions, and that the observations of a number of succeeding years 

 will be necessary before we can arrive at a definite conclusion that the 

 experiment has been followed by a practical, as well as a scientific suc- 

 cess. 



At the close of the author's article upon the Oyster-shell bark-louse, 

 in his first annual report, after speaking of the absence of any signs of 

 the Chalcides, in the northermost part of the State, and of the possible 

 practicability of transporting them thither, we concluded with the fol- 

 lowing remark : 



" The absence of the Chalcis of the bark-louse, in this locality, will 

 I'nrnish an excellent opportunity for testing the practicability of trans- 

 l)orting it thither from those places where it is known to exist. If, after 

 taking the preliminary steps, as described in a former part of this arti- 

 cle, we should find, after the lapse of the necessary time, ui)on the trees 

 experimented with, the characteristic holes in the scales which mark 

 t lie exit of the Chalcis, we would know that the friendly parasite had 

 entered upon its work. If such an experiment could be conducted to 

 a successful issue, it would furnish one of the most admirable instances 

 on record, of the triumph of science, in its application to economic en- 

 tomology." 



