corolla were perforated witli small round holes, and eaten away from 

 the edge. 



Three specimens taken in southern Illinois were dissected April 23, 

 and found to contain vegetable tissues, chiefly of leaves (as shown by 

 the fragments of spiral vessels), without fungi and with more or less 

 chloryphyl. Vegetable hairs and peculiar pollen grains, not those of 

 fruit blossoms, were also recognized. 



Thinking it possible that the curculio might feed on flowers somewhat 

 indiscriminately, we put a number under a bell glass with roses in full 

 bloom. The next day, May 19, the petals were much eaten, and two 

 days later calyx and peduncles had likewise been attacked. The rosG 

 leaves were not injured. When rose blooms and peach leaves together 

 were offered the imprisoned beetles, they fed freely on both. 



Again, May 23, curculios were confined with both bush honeysuckles 

 and snowballs in blossom. The next day the honeysuckle blossoms 

 were eaten, and on the second day those of the snowball also. On the 

 other hand, beetles shut up with peach leaves and peony flowers ate 

 the peach at once, as usual, but refused the peony entirely, not having 

 eaten it at all after ten days. 



INSECTICIDE EXPERIMENTS. 



My first experiments with insecticides for the curculio alone were 

 made July G, 1888. Two lots were placed under glass, with leaves and 

 green fruit of the plum, the food of one being sprayed with Paris green, 

 1 pound to 50 gallons of water, and the other not. The first beetle died 

 in the poisoned lot July 9, and the next day all were dead, the check 

 lot continuing without loss. July 28 a similar experiment was made 

 with Paris green, 1 pound to 100 gallons, applied until the leaves began 

 to drip. The poisoned beetles commenced to die the next day, and five 

 of the six were dead on the 31st. In the check lot of six, on the other 

 hand, only one was dead. 



An experiment begun with 1 pound to 200 gallons was unavoidably 

 suspended in two days, before results were reached. 



Next, April 10, 1889, a lot of curculios, greatly exhausted by long con- 

 finement in transit, were divided into five lots— the first, of twenty-four, 

 a check ; the second and third of twelve each, the fourth of nine, and the 

 fifth of twelve. The food of the second lot w\as treated with Paris green 

 mixed with water at the rate of 1 pound to 100 gallons ; that of the 

 third, with a pound to 200 gallons; the fourth, a pound to 300, and the 

 fifth, a pound to 500 gallons. 



The i^revious hardships of the check lot caused many of them to die, 

 most of them having been insensible, in fact, when first released; but 

 the effects of the poisons were nevertheless evident, as shown by the 

 subjoined table : 



