•546 
into compartments for Petri dishes and for an alcohol lamp and a tin 
can for use in melting the media. As will be seen in the figure, 
provision for holding the Petri dishes in the compartment consists of 
a vertical strip of wood on either side of the compartment. These 
strips do not extend up quite to the top, but stop 1 inch short, so as 
to allow for slipping the dishes in in a horizontal position while the 
agar is not yet firmly set. The compartment for the alcohol lamp 
below that for the Petri dishes needs no special description. Clips 
made of a clock spring serve to hold the pipettes, and these clips and 
the 2 cups for holding the ends of the pipettes at the bottom may be 
seen at each side of the compartments for the lamp and the Petri 
dishes. The compartments for the test tubes and extra supply of 
