PREPARATION OF NUTRIENT MEDIA. 51 



previously peeled, so long as all the eyes have been 

 carefully removed. This plan, however, is not to be 

 recommended, as the sterilisation is not likely to be so 

 perfect as is possible with peeled potatoes, in which 

 every black or dirty speck can be easily seen. 



These are the most important nutrient media .used 

 for bacteriological work ; in a few special cases, slight 

 modifications may be useful; these will be mentioned 

 in the following pages. 



