A Barking Dog

To our left, as seen from the entrance, and not far from the porters lodge, was painted on the wall a huge watchdog on a chain, and written above it in square capital letters were the words Beware of the dog And my companions actually found it laughable but I... 

This experiment must always be carried out behind a protective screen. CS2 has a very low flash point and is highly toxic. The tube must be filled in a well-ventilated hood. Safety glasses and protective gloves must be worn  

Glass tube 120 cm long and 7-8 cm in diameter closed at one end and fitted with a single-bore stopcock (as for a chromatographic column), rubber stop- 

Dinitrogen monoxide N2O in a pressure cylinder, carbon disulfide CS2. Experimental Procedure 

N2O is used rather than NO in this experiment. The glass tube is fixed in an upright position and filled from below with N2O via the stopcock until all the air has been displaced. 5 mL of CS2 are then injected into the tube, which is closed with the stopper. The contents of the tube are mixed thoroughly by shaking, so that the CS2 evaporates and enters the gas phase. 

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