440 THE GYPSY MOTH. 



to 150 gal. water. One died the second, four the sixth, four 

 the seventh and one the tenth day. 

 Check experiment : none dead. 



No. 21. —June 21, 1894. Ten caterpillars, of the third 

 molt, were placed on elm leaves which had been sprayed 

 with Paris green and lime, in the proportion of 1 lb. each 

 to 150 gal. of water. One died the third, two the tifth, two 

 the sixth and five the seventh day. 



Check experiment : one died and one lost the seventh day. 

 No. 22. —June 29, 1894. Ten caterpillars, of the fourth 

 molt, were placed on elm leaves which had been sprayed 

 with Paris green and lime, in the proportion of 1 lb. each 

 to 150 gal. of water. Three died the second, two the third 

 and one the fourth, fifth, sixth, seventh and eighth days. 

 Check experiment : one died the third day. 

 No. 23.— July 11, 1894. Ten caterpillars, of the fifth 

 molt, were placed on elm leaves which had been sprayed 

 with Paris green and lime, in the proportion of 1 lb. each to 

 150 gal. of water. One died and one pupated the second 

 day; two pupated the fourth, two the fifth and one the 

 eighth day ; two died the tenth and one the fourteenth day. 

 Check experiment : one died and one pupated the third 

 day ; one died the seventh, one the eighth and one the tenth 

 day. 



No. 24 (field experiment). — Ten caterpillars, of the fifth 

 molt, were placed on willow branches which had been sprayed 

 with Paris green and lime, in the proportion of 1 lb. each to 

 150 gal. of water. One died the sixth and three the seventh 

 day ; one pupated the eleventh, one the twelfth, two the thir- 

 teenth, one the fifteenth and one the seventeenth day. 



Ih lbs. Each Paris Green and Lime to 150 gal. Water. 



No. 25. — April 26, 1894. Ten caterpillars, three days 

 old, were placed on lettuce leaves which had been treated 

 with Paris green and lime, in the proportion of IJ lbs. each 

 to 150 gal. of water. Five died the second, two the third 

 and one the fourth day, and two escaped. 



Check experiment : one died the fifth day, and five es- 

 caped. 



