966 
be obtained on the bulb'). We have prepared such deposits so that 
we could compare them with the deposits obtained by evaporation. 
As a cathode we used a loop-shaped or spiral-shaped curved wire 
of the metal to be atomized, which was connected inside the glass 
with the platinum feeding-wires. It had been placed in a pear-shaped 
balloon, the latter being united by a narrow tube to the space of 
the anode, in which the platinum-anode was. The latter had been 
entirely fused into a quartz-tube, with the exception of the extreme 
point of some mm?’ surface. The atomizing took place under a 
pressure of */,, mm. mercury, in a dry, oxygenless, current of 
hydrogen, which ran from the space of the cathode to the space of 
the anode to wash away any gases that might come from the anode. 
Silver. The development of heat during the atomizing was such 
that the filament partially melted. As the vapour-tension of silver 
is rather high at the melting-point, part of the silver will evaporate 
in the cathode-vacuum and sublimate against the bulb. The deposit 
thus obtained will therefore be formed partly by atomizing, but 
partly by sublimation as well. 
The colour of the deposit was blue, violet, red or yellow, pro- 
portional to the shorter or longer distance from the bulb to the 
cathode. 
Ultramicroscopically it again showed in the first place a mosaic 
of very small ultramicrons, of equal dimensions, and perfectly similar 
to the deposit obtained by evaporation. By the side of these ultra- 
microns, however, or strictly speaking in the background were much 
larger particles of about 1 gu diameter and separated from each other 
by a distance of 6—12 u. 
As with the experiments on the sublimation deposit, here too part 
of the layer had been covered with Canada Balsam, which being 
softened by careful heating, had been extended over the film, when 
still in the vacuum. By this process the twofold nature of the particles 
of silver clearly came to light. Whereas the Canada Balsam had no 
effect on the mosaic of the underground, the coarser particles above 
were loosened by the balsam and had accumulated on the rim of 
the drop. The line of demarcation of the Canada Balsam which 
otherwise would be imperceptible was now very clearly marked by 
this line of radiant larger particles. 
1) M. FARADAY, l.c. pag. 1. 
L. HouLLEvIGUE, Ann. chim. et phys. (8) 20, 138 (190): 21, 197 (1911). 
H. Frrrze, Ann. der Physik, (4) 47, 763 (1915). 
B. Pogany, Ann. d. Physik. (4) 49, 481 (1916). 
A. Riepe, Ann. d. Physik. (4) 45, 881 (1914). 
