239 



After washing the tube with sulph. acid conc. and 

 afterwards with dist. water, 3 more series of observations 

 were taken. Dröps were formed 



19gOO in a distance of 23,3 cm afler 2^ to 20^ 



26,4 „ „ 4Mo 8^ 

 32,3 „ „ 6Mol6« 



The number of sparks was in the second series 17,3 

 and in the third 12,2. 



§ 1. Though the above iised method of studying this 

 phenoraenon did not give constant results, the observations 

 were nothwitbstanding very instructive. 



It results i. a. the fact that, in the cases in which 

 the point was near the meniscus, the forming of dröps sho- 

 wed itself after a few seconds, which proves that the trans- 

 port of water begins immediately after the current has been 

 estabUshed. 



It could also be observed that the water rims down 

 against the meniscus while the current was going on. When 

 the water had been träns ported upwards in a sufficient 

 quantitity, it began to run down. This seems to go on with 

 interuptions and as much as I could see, at a greater speed 

 than it ought to, in consequence of the gravity and the 

 adhesion to the walls of the tube. Hereby, naturally, two 

 water-streams were going in opposite directions, one, nearer 

 the wall upwards, the other, a httle off the wall, downwards. 



On account of these circumstances the foUowing order, 

 at the experiments, was introduced: 



When the tube had been put in its position (fig.) and 

 moistened, as said above, we waited for half a minute and 

 then the current was set to work during one minute. The 

 tube was removed under a microscope, under which the dröps 

 could not only be counted but also measured with an accuracy 

 of 0,1 mm. Weighing the tube, empty, and with a water-pillar 

 of measured length, the weight of a waterdrop of 1 mm in 

 length, with plane bases, could be calculated. Because the 

 dröps in the tube are limited with meniscus and were mea- 



