17

Experiment II.

       A small room was used—of 830 cubic feet capacity. The same amount of
hydrocyanic acid gas as in Experiment I was introduced without the use of
a fan. The exposure to the gas was for half-an-hour only.

POSITION. RATS. FLEAS. REMARKS.
Dead. Sick. Alive. Dead. Alive.
On the floor     1 ... 1 ... ...  
  4 feet from floor   1 ... 2 All ...  
  6           do.     ... 2 ... ... ...  
10           do.     ... 2 ... All ...  
12           do.     ... 1 ... All ...  

Experiment with Fleas.

Details of covering, etc., enclosing the fleas. Results after 30
minutes' exposure
to the gas.		 REMARKS.
(a) 11 fleas were put in a white cotton
bag and that again enclosed in one
bag of coarse red blanket.		 (a) 9 alive; 2 dead. Another cotton bag
containing 11 fleas
was put between
two layers of blan-
ket and two of cre-
tonne—all dead. In
this case a pipe dis-
charged the gas on
the top of the
blanket.
(b) 12 fleas in a white cotton bag were
enclosed in two layers of coarse
red blanket.		 (b) 7 alive; 5 dead.
(c) 12 fleas in a white cotton bag were
enclosed in three layers of coarse
red blanket.		 (c) 10 alive; 2 dead.
(d) 17 fleas were put in a fine flannel
bag.		 (d) All dead.  
(e) 14 fleas were put in a chintz bag   (e) All dead.  
(f) 15 fleas were put in a cashmere bag   (f) All dead.  
(g) 10 fleas were put in a single cotton
bag and that rolled in a durree,
blanket, coat, and trousers.		 (g) All alive.  

D