ABORIGINAL PLACE NAMES. 779 



turbed by tbc Mfecane invasion, in which Mativvane was con- 

 cerned, to whom reference has already been made. 



Other examples of this class of name are Te.v Tyhert, Bdasi, 

 and Lochenberg. 



D. — Conclusions- 



For tiie present, then, the data, together with these results, 

 must stand as a preliminar)'^ contribution towards our store of 

 knowledge in this sphere of enquiry. The" work represents at 

 least an entrance into a lield that is wholly untouched, and shows 

 almost at a glance how much remains to be done, and the value 

 attaching to serious effort in this direction. 



May many others follow in order to the completion and 

 perfection of the work which, by example and suggestion, has 

 been illustrated and indicated, for perhaps it should be empha- 

 sised that, in spite of the length of this paper, it has not been 

 possible to do more than indicate some of the main avenues by 

 which this rich treasure-house may be ap])roached. 



Helium for Dirigibles. — It is stated in the Revue 

 Gencraic des Sciences* that the preparation of helium on a 

 large scale for inflating dirigible balloons has been one of the 

 most remarkable technical performances of the war. Helium 

 is ahuost as light as hydrogen, over which it has the advantage 

 of being neither inflammable nor explosive, and. its losses by 

 diffusion are less. Helium gas abounds in the sun, but on earth 

 only very small quantities had been collected at great expense. 

 It was found, however, that some Canadian natural gases con- 

 tain about .^;^ per cent, of helium, and a research laboratory 

 was accordingly established at Toronto, the British Admiralty 

 having undertaken to develop the matter. Subsequently tlie 

 United States Bureau of Mines began exploiting sources of 

 helium. The result was that at the close of the war 4,100 cubic 

 metres of heHum were compressed and ready for transport, and 

 plants were under construction for the manufacture of 1,400 

 cubic metres daily at not more than 18 francs per cubic metre. 



The war has probably afforded no more striking instance 

 than the above of the practical bearing of pure scientific research. 

 When Lockyer, forty years ago, found an unknown gas in the 

 sun, no prospect seemed more remote than that within half a 

 century that gas would be used for inflating man's airships. 

 Even when Ramsay, in 1903, discovered that the same gas 

 existed on earth in the mjneral cleveite, such a prospect was 

 outside the limit of sober imagination. To-day the practical 

 man, who enquired into the use of Lockyer's discovery, has as 

 complete an answer as he could desire. 



* 30 [7] 195 (1919)- 



