206 



ounces of the diluted acid ; turned the blower five minutes. 3.55 to 

 4.15 p. in., September 23, sun shining, light breeze. Tree 9 feet tall by 

 S in diameter. Two small pieces of cyanide remained in the generator 

 unacted upon when the tent was removed from the tree. October 19, 

 five dozen leaves and many of the young, lemons were either dead or 

 were more or less injured ; found no live red scales. 



(209) Took 7 ounces dry cyanide, set generator under the tent and 

 added at once 14 fluid ounces pure sulphuric acid, placing a board over, 

 but slightly above, the generator. 4.40 to 5 p. m., September 23, sun 

 shining, light breeze. Tree 9 feet high by the same in diameter. Octo- 

 ber 19, no leaves or fruit were injured; found four live red scales, lo- 

 cated mostly on the leaves. 



(210) Took 2 ounces dry cyanide and 2J fluid ounces of water, added 

 in a few seconds 2 J ounces pure sulphuric acid. Turned the blower 

 five minutes. 1 to 1.20 p. m., September 25, sun shining, light wind. 

 Tree 8 feet high by 5 in diameter. October 19, about one-fourteenth of 

 the leaves were killed ; found no live red scales. 



(211) Took 4 ounces dry cyanide and 4J fluid ounces of water, added 

 in a few seconds 4£ fluid ounces of pure sulphuric acid. 4.10 to 4.30 p. 

 m., September 25, sun shining, light breeze. Turned the blower five 

 minutes. Tree ten feet high by 9 in diameter. October 19, leaves and 

 fruit uninjured; found no live red scales. 



(212) Took 5 ounces d*y cyanide and 10 ounces of water, added in a 

 few seconds 5 ounces of pure sulphuric acid. Turned the blower five 

 minutes. 5.10 to 5.30 p. m., September 25, sun shining, light breeze. 

 Tree 11 feet high by 9 in diameter. October 19, leaves and fruit unin- 

 jured; found no live red scales. 



(213) Took 7 ounces dry cyanide and 14 ounces water, added at once 

 lh fluid ounces pure sulphuric acid. Turned the blower five minutes. 

 9.30 to 9.50 a. m , September 26, sun shining, light breeze. Tree 12 feet 

 high by 10 in diameter. A piece of loose cotton batting a quarter of an 

 inch in thickness was placed over the opening in the generator, through 

 which the gas passed on its way from the generator to the tent. Octo- 

 ber 19, one- eighteenth of the leaves were killed and several of the green 

 lemons were injured ; found no live red scales. 



(214) Took 5J ounces dry cyanide and 22 fluid ounces of water, added 

 at once 5J fluid ounces of sulphuric acid. Turned the blower five minutes. 

 10.30 to 10.50 a. m., September 26, sun shining, light breeze. Tree 10 

 feet high by 9 in diameter. Placed some cotton batting over the open- 

 ing in the generator as described in the preceding experiment. Octo- 

 ber 19, one-eighth of the leaves were killed and several of the green 

 lemons were injured ; found no live red scales. (Two cats were confined 

 in a barley-sack and placed on the ground beneath the tent before 

 the latter was charged with the gas, and when the tent was removed 

 from the tree both of them were dead.) 



(215) Took 5 ounces dry cyanide and 10 ounces of water, added at 



