COISTTEOL OF INCUBATING TEMPERATURES IX LABORATORIES 



flasks are of tlie same size and fit on tlie pipe frame. Where different- 

 sized crates are used, however, tlio wire covering is advisable. 



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HEATING EQUIPMENT. 



Electricity is used in all cases as the heatintr medium. Two systems 

 of temperature control, however, are used. The temperature-control 



