90 



Prof. G. Quincke on the Constants of 



Bismuth (in CO 2 ). 



2r. 



W. 



cc. 



millim. 

 08650 

 05265 

 0-4238 

 0-3609 



grm. 

 01150 

 0598 

 0500 

 00450 



mgrms. 

 42-31 

 3616 

 37-57 

 39-69 



Mean 



38-93 



9. The same process as was applied in the case of phosphorus 

 was extended to sodium and potassium, with this difference, 

 that the water was replaced by petroleum, in which the drops 

 were received, and that the carbonic acid, after its treatment 

 with carbonate of soda, was thoroughly dried in a wash-bottle 

 and Babo's bulb-tubes by means of hydrated sulphuric acid. 

 The determinations present great difficulties in the case of these 

 metals, since, whenever the carbonic acid is not quite pure or 

 the temperature is a little high, we have oxidation of the surface 

 and phenomena like those with cadmium. It may even happen 

 in the latter case that the metal kindles in the carbonic acid. I 

 have accordingly not been able for potassium to make deter- 

 minations free from error, since a slight oxidation of the sur- 

 face seems to take place even under favourable circumstances. 

 The mouth of the glass tube is readily lined with a border of 

 solid potash, the diameter 2r becomes greater than the mea- 

 surement gave it, and the constant of capillarity found is too 

 great. Accordingly I give the numbers for potassium subject 

 to these reserves. The potassium-drops are readily distin- 

 guished from all others by their great volume. 



Sod 



um (in CO 2 ). 



Potassium (in 



CO 2 ). 



2r. 



W. 



cc. 



2r. 



W? 



a. 



millim. 



grm. 



mgrms. 



millim. 



grm. 



mgrms. 



1-384 



01166 



26-83 



1195 



01552 



41-35 



0-9426 



0-0780 



26-34 



1105 



01444 



41-58 



0-9224 



00785 



27-10 



0-9629 



0-1095 



36-21 



0-895 



0-0665 



23-65 



8295 



00889 



34-12 



0-597 



00465 



24-85 



0-7756 



00840 



3447 









Q-67(^ 



00790 



3717 









0-2218 



0-0242 



34-73 



Mean 



25 75 





Mean 



37-09 



10. For a series of salts, beads of the substances on a hori- 

 zontal platinum wire of measured diameter were molten in a 

 small gas-flame or in the blowpipe-flame of the glass-blowers. 

 More of the salt could be added or taken away, as was required, 



