]46 



The following series is taken with a new tube L^, 29,4 cm 

 in length, 0,4 5 mm diameter with the lacing in at 11, i cm 

 from the lower end. 



See Table of Observations Series X. 



This series shows the nearly parallel course of both 

 the phenomena from the distance 29,6. The curve f c/ M 

 shows the course of the intensity when the cap. tube is 

 taken away. It shows a conslant diminution of the intensity, 

 depending on the augmented resislance. 



In ordre to investigate the influence on the drawn up 

 water of the length of the tube and of its diameter, a new 

 tube Lq was made; its length was 47,7 cm the diam. 0,6 2 

 mm and the lacing in was at 11,2 cm from the lower end. 



See Table of Observations Series XI. 



The first observations in the series indicate the presence 

 of a max. but it was made by and by and as a longer time 

 elapsed between this and the following, we regard it con- 

 venient to omit this observation from the curve Pl. VII, 

 which represents the course of the two phenomena. 



What is here very obvious, is the great quantity of 

 water drawn up by the current. The curve shows a course 

 which does not follow that of the intensity. It is much 

 higher and the curves a h c steps much higher thus in- 

 dicating that the quantity of water increases very much 

 with the length of the tube. The curves d e f and cV &' f\ 

 indicating the course of intensity, when the tube is present 

 and when it is taken away, shows that even here a constant 

 difference is introduced by the augmented resistance. 



§ 5. After a preparatory experiment with solution of 

 clor-kaiium (]• 7o)> whereby at first the tube L^ (0,45 mm 

 diam.) and afterwards the long tube L^ were used. 



In the former case we received: 



