Capillarity of Molten Bodies. 



89 



wet with this solution, so as to remove the last traces of hydro- 

 chloric acid which might be taken over along with it. A black 

 caoutchouc tube and a vertical glass pipe conducted the carbonic 

 acid to the bottom of a beaker filled with water to the height 

 of several centimetres, over the edge of which the gas then 

 escaped. The lower opening of the pipette tubes was brought 

 into this atmosphere of carbonic acid; and care was taken, by 

 moving them about, that the different solidified drops in the 

 beaker-glass should fall at different places on the bottom. 



In the cases of cadmium and phosphorus, which are very rea- 

 dily oxidized, this arrangement was frequently unsatisfactory. 

 The carbonic acid was in this case led into the lower end of a 

 glass tube, A B, of 120 millims. height and 20 miilims. dia- 

 meter, which dipped into a saucer of porcelain filled 15 millims. 

 high with water. The narrow glass tube was completely filled 

 with pure carbonic acid ; a slow current of gas prevented its 

 being mixed by diffusion with atmospheric air. Care was taken, 

 by shifting the porcelain saucer under the fixed glass tube in the 

 middle of which the drops formed, that the single drop should 

 solidify at different places. 



The formation of drops in the different substances takes place 

 in different, and frequently in highly characteristic ways. A 

 mere glance at the solidified drop is sufficient to decide from 

 which of the metals it has been formed. 



Cadmium exhibits a remarkable phenomenon when the car- 

 bonic-acid atmosphere contains traces of air. A long jet of 

 molten metal then falls out of the opening of the glass tube, and 

 speedily becomes tarnished at different points. These spots show 

 clear thin cracks parallel to the axis of the cylindrical jet. This 

 swells regularly out at certain places, where a formation of drops 

 takes place, while the metal surface appears as if oxidized. 



Zinc (in CO 2 ). 



Lead (in CO 2 ). 



2r. 



W. 



«. 



2r. 



millim. 

 579 

 0-543 



0-288 



; 



W. 



grm. 

 0-0840 

 00754 

 00422 







Mean 



OC. 



mgrms. 

 46-17 

 44-20 

 46-61 



45-66 



millim. 

 09949 

 0-^756 

 07668 

 0-7534 



grm. 

 0-2550 

 0-2620 

 0-2225 

 1930 



mgrms. 

 81-58 

 95-23 

 9237 

 81-56 



Mean 



87-68 



Phosphorus (in CO 2 ). 



Antimony (in CO 2 ). 



0-88S2 

 0-8497 

 0-8024 

 0-5325 

 0-5066 



0-0127 

 00123 

 00115 

 0-0092 

 0-0060 



Mean 



4-559 

 4-610 

 4-562 

 3-471 

 3-770 



4-194 



1-308 



0-9224 



0-6357 



1 



01040 

 0-0724 

 0-0480 



Mean 



25-30 



24-99 

 24-48 



24-92 



