350 Illinois State Laboratory of Natural History. 



Table II. 



A few dead bugs were left in the cage each time in 

 order to insure continuous infection if the disease were 

 established, and the forceps used in removing the insects 

 were sterilized before passing from one cage to another. 

 In considering the figures in the above tal)le, however, 

 the number of bugs remaining in each experiment at the 

 close must enter into our estimates, for it was imposi- 

 ble to do more than roughlj^ measure the insects when 

 introduced. The results indicate that under the condi- 

 tions prevailing this disease may be readily communi- 

 cated to young chinch-bugs, whether the organism is 

 used direct from diseased in.sects or from pui-e cultu7-es. 

 Microscopic examination also showed that the usual 

 disease bacteria were present in the bodies of dead 

 insects. In the case of chincli-bugs, the pod-mortem ap- 

 ])earances are not so characteristic as those cited for 

 squash-bugs. The bodies are often slightly swollen, and 



