64 SOLID CULTIVATION MEDIA. 



tilled water. The Masks are provided with compact cotton wool 

 plugs. To make these, a square piece is taken from a sheet of 



Fig. 23. — Mucor Lichtheimii growing on bread paste. 

 On the surface of the delicate growth, small translucent yellow 

 beads of liquid (whichs give an alkaline reaction) are seen. 



cotton wool, and the corners consecutively turned inwards towards 

 the centre, till a firm round mass is produced. This is pushed into 



