Professor Dewar 



[Jan. 20, 



published mis-statements of fact. No satisfactory explanation has yet 

 been given by Professor Ramsay of his twice-repeated categorical state- 

 ments made before scientific bodies of the results of experiments 

 which, in fact, had never been made by their alleged author. The 

 publicity that has been given to this controversy makes it imperative 

 that the matter should not be passed over, but once for all recorded. 

 The report of a Friday Evening Discourse on " New Researches 

 on Liquid Air " * contains a drawing of the apparatus employed 



Fig. 1. 



for the production of a jet of hydrogen containing visible liquid. 

 This is reproduced in Fig. 1. A represents one of the hydrogen 

 cylinders ; B and C, vacuum vessels containing carbonic acid under 

 exhaustion and liquid air respectively ; D is the coil, G the pin-hole 

 nozzle, and F the valve. By means of this hydrogen jet, liquid air 

 can be quickly transformed into a hard solid. It was shown that 



* ' Proceedings ' of the Royal Institution, 1S9G. 



