REPORT OF PROF. R. W. JONES. [23] 



half of the Aletiaj had fallen to the gTonnd and were in convulsions, the younger worms 

 falling first. At the end of one hour there were hut four laiviii of Aletia on the cotton 

 that had heen reached hy the extract, and these were evidently much affected hy it. 

 Next morning I found only one Aletia larva alive on these plants. 



I took seven chrysalids of Aletia from these plants that received the spray, and 

 slso at the same time took other chrysalids from a part of field not reached hy the 

 spray. 



Only one of the first lot of chrysalids showed signs of life afterward, and it died in 

 the effort to extricate itself from the pupa-covering. The other lot of chrysalids treated 

 similarly in ajar produced moths. 



5. On Cahbage Worms. 



(a) Twenty-two worms, some Pionea rimosalis, some Pieria oleracea. Extract 

 pyrethrum in methyl alcohol. Strength of liquid : 1 part extract to 30 parts of water. 

 Every worm killed in a few minutes. 



(b) Twenty worms as above, three green, the others Pionea rimosalis. Extract 

 pyrethrum in common alcohol. Strength : 1 of extract to 30 of water. In four min- 

 utes worms were all dead hut four ; three Pionea escaped, and one Pieris. The small 

 worms were killed first in both experiments, as I found to be almost invariably the 

 case with Aletia and Heliothis. 



6. September 21, on Boll Worms. 



Foliage so dense as to afford the best possible protection. Extract of pyrethrum in 

 methyl alcohol. Strength: 1 to 32 of water. Threeof these worms were three-foiirths 

 of their lengths in the bolls, the fourth was entirely concealed. I threw a very small 

 quantity of the liquid on this cotton ; for three or four minutes there was no move- 

 ment of the worms, but presently they came forth suddenly from the bolls, began to 

 crawl uneasily on the leaves and stems, soon fell to the ground, and in one hour and 

 four minutes three were so nearly dead as to make it certain they would die ; one 

 crawled off, showing some signs of paralysis. Not having time to wait in order to 

 ascertain if it would die, I sprinkled a small quantity of the same liquid on it ; then 

 its crawling quickly ceased. All these were large larva?. 



7. September 28. Extract pyrethrum in methyl alcohol. Strength : 1 part extract 

 to 40 of water. Sprayed liquid at 10.45 a. m. on a very large number of worms (Aletia), 

 covering a considerable -area. All the small worms were killed in an hour. Nearly all 

 the large larvce fell to the ground, but many of these succeeded in crawling away, and 

 some ascended the plants, while others of the same size died in convulsions. 



Many other experiments were made by me, but nothing was developed not included 

 in those cited above. 



I have the honor to be, very respectfully, &c., 



R. W. JONES, 

 /fecial Agent, U. S. E. C, Oxford, Miss. 



