of Flame and Gases. 411 



that carbonic oxide was driven away equatorially with consi- 

 derable power; and I judge from the appearance, that it is 

 more diamagnetic than carbonic acid. 



Nitrous oxide. — This gas was moderately, but clearly, dia- 

 magnetic in air. Much interest belongs to this and the other 

 compounds of nitrogen and oxygen, both because they contain 

 the same elements as air, and because of the relations of ni- 

 trogen and oxygen separately. 



Nitric oxide. — I tried this gas both as an up and down 

 current, but could not determine its magnetic condition. What 

 with the action of the oxygen of the air, the change of the 

 nature of the substances, and the heat produced, there was so 

 much incidental disturbance and so little effect due to magnetic 

 influence, that 1 could not be sure of the result. On the whole 

 it was very slightly diamagnetic ; but so little, that the effect 

 might be due to the smoke particles which served to render it 

 visible. 



Nitrous acid gas. — Difficult to observe, but I believe it is 

 slightly magnetic in relation to air. 



Olefiant gas was diamagnetic, and well so. The little dif- 

 ference in specific gravity of this gas and air, even creates a 

 difficulty in following the course of the olefiant gas, unless it 

 be watched for on every side. 



Coal-gas. — The coal-gas of London is lighter than air, being 

 only about two-thirds in weight of the latter. It is very well 

 diamagnetic, and gives exceedingly good and distinct re- 

 sults. 



Sulphurous acid gas is diamagnetic in air. It was generated 

 in a small tube containing liquid sulphurous acid ; this being 

 connected, in place of the gas bottle, with the delivery-tube 

 and mouthpiece by the vulcanized rubber tube. The presence 

 or absence of the gas in the catch-tube was well shown by 

 ammonia, and still better by litmus paper. 



Muriatic acid. — I'he retort in which it was generated was 

 connected, as just described, with the delivery-tube. The gas 

 was very decidedly diamagnetic in air. 



Hydriodic acid was also diamagnetic in air. When there 

 was an abundant stream of gas, its entrance into and passage 

 through the side catch-tube, on rendering the magnet active, 

 was very striking. When there was less gas, the stream was 

 dispersed equatorially in all directions, and less entered the 

 tube. 



Fluo-silicon. — Diamagnetic in air. 



Ammonia, — This gas was evolved from materials in a retort, 

 and tested in the catch-tube above by muriatic acid in the 

 paper. It was well diamagnetic, corresponding in this respect 



