TANKS OF ICE WATER 67 
BACTERIA PER CC. 
ae Cooled by Tem.| 12 Hrs.| 15 Hrs. | 18 Hrs. | 21 Hrs. 24 Hrs. 
4000 | Ice water..... 38° 2,500 3,100 4,800 8,300 8,500 
4000 | Next to ice....] 40 2,600 2,500 3,500 8,000 16,000 
4000 | Nearice...... 45 3,000 3,200 8,000 15,000, 25,000 
4000 | In ice box.....] 50 11,000 13,000 15,000 24,000| 44,000 
4000 | Next toice box.} 55 18,000 18,000 24,000} 70,000) 73,000 
4000 | Running water | 60 24,000 80,000] 120,000 304,000) 260,000 
4000 | Room temp...| 65 330,000 1,400,000 5,000,000 15,000,000 4,000,000 
(Note the big changes occur above 50° F.) 
TANKS OF ICE WATER 
Tanks of ice-water are the simplest and most 
effective form of farm cooling. They are built 
of cement or iron or wood. They should be 
deep enough to bring water up to the neck of 
