
24 STORRS AGRICULTURAL EXPERIMENT STATION. 
Room No. 2. The most essential part of a bacteriological 
laboratory in which accurate work is to be done is the dust-  — 
proof room-.where plate cultures may be made and various or- | 
ganisms transferred from one receptacle to another with the ~ 
least possible danger of contamination from external bacteria | 
and moulds. ‘The atmosphere in an ordinary room, especially 
if there is any draught, is lable to be filled with bacteria and 
mould spores. A picture of this room will be seen in Fig. 2. 

Fig, (2: 
Room No. 2. DuST-PROOF ROOM OF DAIRY BACTERIOLOGY LABORATORY. 
This dust-proof room is six by eight feet in size, entirely of 
glass set in putty so that dust cannot enter. The room is well 
supplied with shelves for the storage of sterilized glassware. 
In this room cultures may be made with very little danger of 
external contamination. 
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