Feb., '06] 



ENTOMOLOGICAL NEWS. 



5 1 



But the walls of the funnel, thanks to the water surround- 

 ing them, are so warm that the insects cannot remain, and 

 they fall, rolling downward until they enter the tube contain- 

 ing alcohol, in which only a very small quantity of detritus is 

 collected. 



It is necessary, however, not to shake or stir the apparatus 

 or the material during this operation, to avoid the falling of 

 too much detritus together with the insects. 



Fig. 2.— Apparatus for indirect heating by means of the boiler <o) : In the figure at the 

 right we see the manner of inserting the glass tube containing the alcohol into the apex 

 of the funnel, tbat is by means of a ring or very short tube of India rubber (a). 



The figures, which show two styles of such apparatus, repre- 

 sent in one case (Fig. 1) the heating by direct application, 

 and in the other case (Fig. 2), by means of a species of boiler, 

 always using a Bunsen or an alcohol lamp by which to main- 

 tain a high temperature in the water for a long time. As for 

 the rest, any one can vary the construction of the apparatus as 

 he may think best, granting that the walls of the funnel be 

 always much inclined, at least 60 degrees. The diameter of 



