HOW THE TEST IS MADE Q7 
(4) Exactly 1 cc. (1 thimbleful) of this mix- 
ture of milk and water is drawn out of the dilu- 
tion-bottle by another glass tube and discharged 
DISCHARGING THE DILUTED MILK INTO A STERILE 
GLASS DISH 
onto a flat glass dish having a cover. This dish 
has also been sterilized. 
(5) Into the dish is then poured an exceedingly 
stiff jelly made from a Japanese sea-weed called 
agar. The jelly contains a little beef tea to 
furnish food for the bacteria. When spread out 
on the glass dish it hardens and all of the bac- 
teria in the milk are glued fast. 
