276 PROCEEDINGS OF THE INDIANA ACADEMY OF SCIENCE. 



Sterilization by Drv Heat. 



For hot air sterilization the "Lautenschlager" ovens are quite satisfactory. 

 The large amount of sterile glassware necessary for soil work and the de- 

 sirability of handling the glassware by the ovenfui had led to the supplement- 



/\ 



10 



10 



Iccrm 



V 



Scale 4 in. = Iff. 



Figure III — Pipettes and jiipette case. 



ing of the "Lautenschlager" oven l)y a two burner gas plate and several 

 (i<'tachable l)aking ovens. A square of asbestos is laid over each burner to 

 diffuse tlu! lieat, and holes about one insh and a half in diameter are made 

 in the top lining and top of each oven, to allow the moisture formed by the 



