CHEMICAL ACTION FROM A CAPILLARY TUBE. 5 



was produced, a portion of which I am able to 

 show. 



No. II. Knowing the silica produced by the action of 

 ammonium chloride on sodium silicate was much 

 denser than that obtained in the previous experi- 

 ment, I caused these substances to act on each 

 other, and succeeded in obtaining a very long tube 

 of silica of considerable thickness. I am able to 

 show this also. 



No. 12. Ferrocyanide of potassium on ferrous sulphate. 

 Notwithstanding the extreme lightness of the blue 

 precipitate produced by these solutions, a perfect 

 tube was obtained, which reached the surface of 

 the ferrous sulphate. 



Many experiments on the above lines will readily 

 suggest themselves ; but I think I have described sufficient 

 to call attention to this, to me, novel method of experi- 

 ment, and I must leave it to some future occasion to 

 describe such others as may show any peculiarities worth 

 noting. I purposely refrain from making any theoretical 

 deductions, with the one exception that it is pretty certain 

 that these phenomena are inseparably connected with 

 vortex-action, the tubes being undoubtedly built up of a 

 series of vortex-rings. 



