754 Scientific News. [ October, 
absence, and took the field later in the season at points to which 
future experience may direct. Prof. Riley has been at various . 
points in Mississippi, Alabama and Georgia. He has traveled 
from point to point superintending the work and advising with 
his assistants. Towards the end of September he expects to go 
to California to investigate the facts concerning the cultivation of 
Pyrethrum, which may prove a valuable and safe antidote to the 
cotton worm. He has already taken steps to introduce this plant 
into the Southern States. | 
In their investigation of the Rocky Mountain locust, Profs. 
Packard and Thomas have been assisted by Prof. Aughey and 
r. Lawrence Bruner, of Nebraska, Dr. John Marten, of Carbon- 
dale, Illinois, and Mr. Allen Whitman, of Minneapolis, Minn. 
In Utah, Messrs. J. L. Barfoot, Orson Howard and Mr. E. E 
Wood, of Chicago, have rendered assistance. 
Prof. Packard visited Wyoming and Utah, while Mr. Bruner, 
his assistant for Montana, left home July 1st, going from Bis- 
marck overland to Fort Keogh, and thence up the Yellowstone 
valley to Bozeman. When last heard from he was at Helena ex 
route for Benton. He was in the field two months. 
Prof. Thomas left Carbondale on the ioth of July for an ex- 
tended exploration of those parts of Dakota and British America 
which embrace some of the most important regions in the perma- 
nent breeding grounds of the locust. 
The result of the locust investigations for this season shows a 
remarkable immunity from the attacks of Caloplenus spretus, the 
species of locust under consideration. A single swarm was 
observed in Utah, and local scattered flights of inconsiderable 
importance in Dakota and Minnesota, and Eastern Oregon, near 
Walla Walla. For the first time for many years Montana has 
been free from the locust, only scattered individuals having 
occurred in the Yellowstone valley. The researches of the Com- 
mission now carried on for four seasons has cleared up the question 
of the permanent breeding grounds of the locust, which exists in 
Montana, in the valleys of the Upper Missouri, the Judith basin and 
the Yellowstone valley with its tributaries. From this region the 
swarms visit the border States to the eastward, and also pass 
down into Utah and Wyoming. Colorado is mostly visited by 
swarms local to that State, while large swarms have arrived from 
Wyoming in former years. The second report of the Commis- 
sion is in press and will appear in November, and the third is im 
preparation, — : 
The investigation of the locust will be resumed in the spring of - 
1881, Prof. Packard designing to spend the month of June in por- 
tions of Utah, Idaho and Montana, so as to bring the work down 
to June 30th of next year, when by law the special field work con- 
nected with the investigation of the Rocky Mountain locust ceases. 
It is believed that this locust will never be so destructive as in the 
