EXAMINATION OF WATER FOR MICRO-ORGANISMS 81 



obtain uniform contact between the sensitised paper 

 and the 'plate it is advisable to interpose a piece of 



FIG. 14. PHOTOGKAPHIC REPRODUCTION OF A GELATINE-PLATE CULTURE. 



a, the glass plate ; b, the gelatine film ; A, colonies causing liquefaction of the gelatine. 



(After de Giaxa.) 



thick cloth between the paper and the board on which 

 it rests. The plate is further covered with a thin glass 

 bell-jar, in order to protect it from dust and other 

 foreign particles. 



G 



