Testing Germicidal Value of Liquids 



255 



ture of the water in the pail is taken, and if above or below 20°C., 

 it is brought to the desired temperature by the addition of either 



Fig. 88. — Water-bath showing position of holes for seeding tubes and ther- 

 mometer in place (Anderson and McClintic, in Bulletin No. 82, Hygienic 

 Laboratory). 



Fig. 89. — Cross section of water-bath showing seeding tubes in place (Ander- 

 son and McClintic, in Bulletin No. 82, Hygienic Laboratory). 



hot or cold water. When the proper temperature has thus been 

 adjusted, very little change takes place in an hour's time. The 

 apparatus is shown in the cut. 



