440 Intelligence ami Miscellaneous Articles. 



of the carbonic acid with the probable errors ; in the third, the 

 quantities of gas dissolved, also with the errors ; and in the last, 



PA.. 



^ and — , again with the errors. 



The errors are put in parentheses. 

 20-53 410-25 + (l-5) 0-67281 -(0-00029) p =4-057 + (^,'.[323)* 



20-59 101-11 ±(0-2) 0-16723 + (0-00002) ^=4-023 + (0-001). 



P 



13-04 478-05-(0-78) 0-84427 + (0-00018) p =2-442 + (0-011). 



13-04 918-5 +(1-5) 0-33244 + (0-00023) -^=2-540 -(0-002). 

 7-08 452-93 -(0-2) 0-84818 -(0-00029) -5- =2-442 + (0-008). 

 7-1 185-5 -(0-7) 0-33395 -(0-00013) ^ = 2-540 + (0-002). 



We see that if carbonic acid does not rigorously follow Dalton's 

 law when dissolving in carbon disulphide, the deviations are very- 

 small and are of the same order as those which it shows in respect 

 to the law of Mai-iotte. At low temperatures its absorption is 

 greater, and at high temperatures less, than that indicated by 

 Dalton's law. — Com^Ues liendus, April 1, 1889, p. 674. 



ON A VOLTAIC CUERENT OBTAINED WITH BISMUTH IN A 

 MAGNETIC FIELD. BY DR. G. P. GRIMALDI. 



The experiments made by Nichols * on the influence of magnetism 

 on the passivity of iron led me to investigate whether there was 

 anything aualogons in the case of bismuth. 



After many fruitless attempts I made the folio vviiig experiment 

 with favourable results. 



A wide U-tube contains a dilute solution of bismuth chloride in 

 hydrochloric acid ; in the vertical limbs dip two wires of chemically 

 pure bismuth very carefully polished. 



One of these wires with the tube containing it is placed between 

 the conical pole-pieces of a Faraday's electromagnet of medium sine, 

 in such a way that the surface of the liquid is in the most intense 

 part of the field. The two wires are joined up to a very sensitive 

 Thomson's galvanometer with astatic needles. On closing the 

 circuit a cui-rent is observed in the galvanometer which might be 

 thought to be a primary one due to a diversity of the two bismuth 

 wires. This current, which at the outset varies rapidly, diminishes 



* Silliman's Journal, vol. xxxiv. 1887, p. 419, and vol. xxxv. 1888, p. 290. 



