1901 - 2 .] Dr Noel Pat-on on Dissolved Oxygen in Water. 149 
On the same day at 11 a.m. a fish from the flask B. was put 
in the bottle and died in 40 minutes. 
At 11.45 three small fish were put in the bottle, and at 12.30 
two were dead and the last died at 12.55. (Oxygen =1 cc. per 
litre.) 
B. The smaller fish died next morning. Oxygen = 3 cc. 
C 1 . The fish lived in this w^ater till 3.20 p.m. on the second 
day (55 hours). 
Oxygen per litre — 
First day 1 p.m. 2 cc. 
Second day 10 a.m. 3 cc. 
Third day 10 ,, 1 to 2 cc. 
,,' 12 noon 0 cc. 
At 11.45 a small fish was introduced and it died at 2. 
C 2 . The fish lived till 6 p.m. on the next day (30 hours). 
Oxygen per litre — 
First day 1 p.m. 5 cc. 
Second day 10 a.m. 0 cc. 
At 3.20 on the second day the water from these two beakers 
was combined — oxygen = 2 cc. per litre — and a fish from the tank 
put in. At 4 o’clock it was almost dead. 
Experiment V. — The Wolff’s bottle was put up with 2600 cc. 
water and the flask B. was charged with water from the last 
experiment to the same amount. 
Next day at 10 a.m., T. 13° C. — 
A. Oxygen = 3 cc. per litre. 
P- 55 ^ 5 5 5 5 5 5 
At 11.30 three trout were put in each. 
A. At 3 p.m. one fish was dead. 
3.30 p.m., oxygen = 2 cc. 
At 8-30 p.m. the other two fish were dead. 
B. The fish in the flask were well and lively at 4 p.m. on the 
third day. Oxygen = 5 cc. 
