CHEMICAL ACTION FROM A CAPILLARY TUBE. 8 



The same results were obtained^ though the growth 

 was less stable, as the potassium dichroraate being 

 of much smaller specific gravity, no support was 

 given to the lead chromate formed^ and thus the 

 growth continually fell off the point of the 

 syphon. 



No. 3. A cold saturated solution of sodium sulphate was 

 passed into a saturated solution of barium chloride. 

 A perfectly straight tube was obtained^ which 

 formed with great rapidity and was very stable. 

 This result was most unlocked for, taking into con- 

 sideration the great density of barium sulphate. 



No. 4. A solution of ammonium oxalate was passed into a 

 solution of calcium chloride. These particular 

 solutions were chosen because the amorphous cal- 

 cium oxalate first produced, on mixing these solu- 

 tions rapidly, becomes crystalline, and the effect 

 could not be surmised on mixing with a capillary 

 tube. The usual phenomena took place until the 

 tube reached the height of about one inch, when 

 the amorphous calcium oxalate suddenly changed 

 to the crystalline variety, and apparently stopped 

 the action, as no further upward growth took place. 

 On careful examination, however, of the point of 

 the growth, a fluid was noticed to emerge, which 

 had no action on the surrounding calcium chloride, 

 showing that chemical action was still going on. 

 Now, the upward growth having ceased, it was 

 inevitable that the tube should become wider, and 

 this is what really took place. On another expe- 

 riment I obtained a nearly spherical body about 

 half an inch in diameter. 



No. 5. Action of ammonia on ferrous sulphate. A very 



b2 



