LIQUIDS AND ALLIED EXPERIMENTS. 



23 



by the flow of hydrogen into them, so that they finally break off or may be 

 shaken off. After the first few days such bubbles no longer occur. This is 

 additional confirmation to the effect that hydrogen here diffuses from 

 apparent low pressure to apparent high pressure, so far as water levels are 

 concerned, in cases where it enters a medium of air, however small; i. e.,the 

 gradients due to mixture imply that p a >h"p ic g, p h <B — ir, since p a -\-p h = 

 B J rh"p w g — ir is constant. Wherever the water is continuous or in actual 

 contact with the glass, no bubbles are produced. Neither do they ever 

 occur for the diffusions of air into air. 



Table 4. — Diffusion of hydrogen through water into hydrogen. 



A =0.005823; M= 18.09; Pm= 13-6; h' = o.8 cm.; h" ' = 11.0 cm.; ^'" = 5.5 cm.; /=22.ocm.; 



1 Ipq = 0.3486*; water-head 0.06 cm. Hg. 



Areas: 12.6 cm. 2 ; 24.6 cm. 1 . Diameters: 4.0 cm.; 5.6 cm. 



Date. 



Hour. 



Barometer. 



II 



t 



Observed 



wXio 6 



Computed 



mXio 6 



A mXio' 





h. m. 

















Mar. 15 



4 00 



74-44 



61 .51 



20.0 



799 



804 



- 5 



16 



4 00 



75 



44 



59.67 



13. 1 



793 



795 



— 2 



«7 



• 3 30 



76 



64 



59.19 



16.9 



777 



785 



- 8 



18 



4 00 



75 



80 



60.18 



22.6 



776 



775 



+ 1 



'9 



4 00 



76 



04 



59.65 



22.4 



769 



765 



+ 4 



20 



• 3 30 



74 



51 



59.46 



23.4 



764 



756 



+ 8 



21 



• 3 45 



75 



57 



58.03 



20.2 



754 



746 



+ 8 



22 



• 3 3o 



74 



61 



56.97 



20.9 



739 



736 



+ 3 



23 



• 3 30 



75 



46 



55.66 



19.0 



726 



726 







24 



• 3 30 



76 



54 



54.01 



17.8 



707 



717 



— 10 



25 



• 3 45 



77 



02 



53-'7 



17.7 



696 



707 



— 1 1 



26 



• 4 3o 



76 



54 



5325 



21.5 



689 



697 



- 8 



27 



• 3 45 



75 



07 



53.16 



21.8 



687 



688 



— 1 



28 



• 3 45 



74 



59 



53.02 



22.4 



684 



678 



+ 6 



29 



4 00 



74 



83 



52.37 



22.2 



676 



668 



+ 8 



30 



4 00 



73 



77 



51.63 



21 .2 



668 



658 



+ 10 



3' 



4 00 



74 



53 



50-53 



19.6 



657 



649 



+ 8 



Apr. 1 



• 3 30 



75 



37 



48.99 



17.9 



641 



639 



+ 2 



2 



5 00 



75 



97 



47-41 



16.0 



624 



629 



- 5 



3 



• 3 30 



76 



7' 



46.51 



16.6 



613 



619 



- 6 



4 



4 00 



77 



37 



46.01 



16.5 



605 



610 



- 5 



5 



4 00 



75 



25 



45-49 



16.8 



597 



600 



- 3 



6 



• 3 45 



75 



3' 



45.82 



19.7 



596 



590 



+ 6 



7 



3 00 



75 



47 



45-39 



20.2 



589 



580 



+ 9 



8 



• 4 30 



76 



43 



44- 17 



18.2 



577 



571 



+ 6 



9 



• 4 30 



76 



28 



43.02 



17 3 



564 



561 



+ 3 



10 



4 00 



76 



86 



42.46 



19.2 



553 



551 



+ 2 



11 



■ 3 30 



77 



25 



41.36 



19.0 



539 



542 



- 3 



12 



• 3 30 



77 



52 



40.05 



17.8 



524 



532 



- 8 



«3 



4 00 



77 



36 



39.62 



19. 1 



516 



522 



- 6 



•4 



• 3 45 



76 



25 



38.98 



17.8 



510 



512 



— 2 



*Cf. §24. 



After March 9, however, the regular decrease of weight begins, again 

 abruptly, due to the transpiration of hydrogen in accordance with the 

 pressure gradient (water-heads) alone. After March 20 it progresses with 

 satisfactory uniformity until April 14, when the experiments were broken 

 off, as it seemed improbable that further characteristic changes would occur. 



