THE BACTERIOLOGICAL LABORATORY 33 



n. 



It is heated by a gas-burner, and is made to 

 hang against the wall of the laboratory. 



The steriliser represented in Fig. 1 1 l is either 

 heated by paraffin-oil or by gas. It consists of a 



I I /O Q '&<^L> 4j f 



H/g? 5> & Q O 



Q 



-^FFT T '^W 



Fio. 11. HOT-AIR STERILISER HEATED BY PARAFFIN OIL OR GAS. 



(Devised by Mrs. A. B. Griffiths.) 



A, Thermometers. B, Copper Shelf with Holes of different sizes. C, Mica 



Window. D, Iron support for Oven over Flame. E, Paraffin Oil 



Lamp. F, Screw to raise Wick. G, Wire Gauze. 



sheet-iron chamber, provided with shelf containing 



1 First described by the author in the Proceedings of the 

 Poyal Society of Edinburgh, vol. xiv. p. 105. 



C 



