ENZYMES. 39 
81. Glass Graduates for Measuring. 
But the minim graduate is funnel shaped, and the top being 
broad in proportion to its volume, the chances for error are still 
too great in measuring. In actual practice, through haste in 
making the test, two or three drops of extract were likely to be 
left in the narrow bottom of the minim graduate, and the maker 
would be confused in not getting the results he expected by de- 
pending on it. 
PG ee 
Fig. 20.—The Monrad Rennet Test. 
J. H. Monrad therefore proposed a new set of apparatus, 
which, though not so simple, leaves less chance for error. 
82. The Monrad Rennet Test. 
The apparatus for the Monrad test consists of a 160 e«. ¢. 
tin cylinder for measuring the milk, a 5 ¢. ¢. pipette, a 50 c. ¢. 
glass flask, and a half-pint tin basin. By filling the tin cylinder 
till it overflows it always gives the right measure of milk quickly. 
Measuring the milk in a glass graduate is difficult, as it is hard 
to get the milk just to the mark, and if the glass is covered with 
white milk it is difficult to see the mark. 
