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simplest possible description, consisting of a pair of cylinders 

 connected by a capillary syphon, the effluent end of which 

 was bent upwards. One cylinder was raised slightly above 

 the other to insure a flow. I have a photograph of the 

 general arrangement adopted. 



2. Solutions of Lead Acetate and Potassium Bichromate 

 were allowed to mix in this manner. The latter salt was 

 passed into the former. The capillary syphon was charged 

 with water, and after this had passed through the heavier 

 fluid a series of vortex rings began to be formed at the point 

 of the tube. Later one attached itself to the tube, and 

 others to this, until a tube was built up through which the 

 Potassium Dichromate was passed without any chemical 

 action taking place to the top of the Lead Acetate. This 

 action continued until the system reached an equilibrium. 

 Fearing that I could not show the experiments before the 

 Society I photographed some of them, and they show 

 exceedingly well the curious growths of Lead Chromate 

 which were thus produced. With these two substances to 

 obtain a single tube was most difficult, and only a series 

 could be obtained with anything like certainty. 



An experiment was made reversing the fluids. The 

 same results were obtained, though the growth was less 

 stable, as the Potassium Dichromate 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. 



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 

 unlooked for taking into consideration the great density of 

 Barium Sulphate. 



4. A solution of Ammonium Oxalate was passed into a 

 solution of Calcium Chloride. These particular solutions 



