REPORT OF THE ENTOMOLOGIST. 141 
four minutes, after which the pipes were again connected, and the rest of the sul- 
phur run into the furnace in six minutes ; the air in the tent was then stirred for 
five minutes. Tent left on tree fifty minutes. Only a few of the leaves and Iceryee 
were killed. 
(120) Run 29 ounces of sulphur into the furnace in twenty-four minutes, and 
allowed the vapor to pass into the tent of its own accord. After the sulphur had 
been running into the furnace for eight minutes its flow was stopped, the pipes dis- 
connected, and the furnace fired up for two minutes; and this was repeated until 
all of the sulphur had been run into the furzace, after which the air in the tent was 
stirred for five minutes. Left tent on tree for one hour. Tree 10 feet tall. No 
leaves and only a few Iceryx were Killed. 
(121) Run 5 ounces of sulphur into the tent in twenty-five minutes. The furnace 
was fired up after the sulphur had been running into it for five minutes, and this 
was repeated until all of the sulphur had passed into the furnace, after which the 
air in the tent was stirred for five minutes. Left tent on tree one hour. Tree 10 
feet tall. No leaves and only afew Iceryz were killed. 
(122) Run 16 ounces of sulphur into furnace in twenty-five minutes, then stirred 
air in tent for five minutes. The furnace consisted of a piece of terra-cotta pipe, 3 
feet long and 8 inches in diameter ; a hole was made through it near the bottom by 
which to light the charcoal in the furnace, and there were four other holes along 
one side of the furnace for the purpose of firing up the latter, which was accom- 
plished by the use of a Cummings’ blower. The entire furnace was inclosed in a 
sheet iron to which the blower was attached, and a pipe led from the top of the 
furnace into the bottom of the tent ; the sulphur was inserted in a piece of gas-pipe 
that passed to the inside of the furnace. Left tent on tree one hour. Tree 10 feet 
tall. The bisulphide was allowed to pass into the tent of its own accord. No 
leaves and about one-sixth of the Icerys were killed. 
(123) Inserted 1; pounds of sulphur into furnace in forty minutes, inserting much 
of it through the hole in the furnace by which the charcoal is lighted ; stirred air 
in tent almost continuously during the time that the sulphur was being inserted 
into the furnace ; the bisulphide was allowed to pass into the tent of its own accord. 
Left tent on tree one hour and a half’; disconnected furnace from tent half an hour 
before removing the latter from the tree. Leaves slightly injured; only a few 
Icerye were killed. 
(124) Inserted 1} pounds carbonate of ammonium in lower part of furnace in thirty 
minutes, allowing the vapor to pass over the hot charcoal and into the tent of its 
own accord. After inserting the ammonium the air in the tent was stirred for ten 
minutes. Left tent on tree for one hour: disconnected furnace from tent fif- 
teen minutes before removing latter from tree. Tree 10 feet tall. No leaves and 
only a few Iceryze were killed. A whitish deposit remained upon the leaves. 
(125) Inserted 2? pounds of sulphur in lower part of furnace in thirty-five min- 
utes, during which time the air in the tent was stirred almost continuously. Left 
tent on tree one hour; disconnected furnace from tent five minutes before remov- 
ing latter from the tree. Tree i0 feet tall. No leaves and only a few Iceryze were 
killed. 
(126) Inserted in lower part of furnace 3 pounds of sulphur in packages of 8 ounces 
each at intervals of six minutes apart; during this time the air in the tent was 
stirred occasionally. Left tent on tree one hour; disconnected furnace from tent 
five minutes before removing the latter from the tree. Tree 10 feet tall. Leaves 
slightly injured; only a few Iceryz were killed. 
(127) Inserted 5 pounds of sulphur into lower part of furnace in 10-ounce pack- 
ages at intervals of six minutes apart. After the lapse of thirty minutes from start- 
ing the air in the tent was stirred for ten minutes. Left tent on tree for one hour 
and a half; disconnected the furnace from the tent five minutes before removing 
the latter. Tree 10 feet tall. One-third of the leaves and three-fourths of the 
Icerye were killed. : 
(128) Put 3f pounds of refuse tobacco stems on top of the red hot charcoal in the 
furnace and allowed the vapor to pass into the tent for fifteen minutes; then blew 
a blast of air through the furnace for five minutes, without disconnecting the fur- 
nace from the tent, after which the vapor was allowed to pass into the tent of its 
own accord, and the air in the tent was stirred for ten minutes. Left tent on tree 
one hour; disconnected the furnace from the tent five minutes before the latter was 
removed from the tree. Tree 10 feet tall. Leaves uninjured; found no living 
Icerye. 
(129) Inserted 34 pounds of sulphur into lower part of furnace in packages of 102 
ounces each, a package being inserted at the end of every twelve minutes. After 
all of the sulphur had been inserted the air in the tent was stirred for ten minutes. 
Left tent on tree one hour and a half; disconnected furnace from tent five minutes 
