THE PINE INVESTIGATION. 



313 



important precaution, it did not seem necessary; since the 

 Clerid had demonstrated its ability, under ordinary conditions, 

 to keep the bark beetles under complete control. With this 

 knowledge of the capacity of the Clerid in destroying bark 



Fig. XLIL Larva of European bark 

 beetle destroyer greatly enlarged. 



Fig. XLIIL Pupa of European 

 bark beetle destroyer greatly en- 

 larged. 



beetles, I felt very well sat- 

 isfied that if it could be suc- 

 cessfully introduced into 

 America, and would become 

 established in our coniferous 

 forests, that it would, under favorable conditions, accom- 

 plish the desired end. We returned to the hotel at 5 p. 

 in., and after making further arrangements with Mr. H. Strah- 

 meyer to engage a sufficient force of help to collect the Clerids 

 in the greatest possible numbers during my stay in Germany, 

 and to collect and forward material to me after my return to 

 America, I returned to Strassburg, where I arrived that night. 



FURTHER WORK PREVENTED BY A CHOLERA EPIDEMIC. 



Upon going to my hotel, I found a letter which, as the follow- 

 ing extracts will show, presented some discouraging features to 

 my proposed prosecution of the work, and when I had procured 



