360 PEINCIPAL HENEY A. MIERS AND MISS FLOKENCE ISAAC ON THE 



2. fi-showers. 



3. y -showers. 



In some of these experiments the acid appears to become inoculated at the edges of 

 the beaker a short time before the shower occurs, and this may bring the shower down 

 a little too early, but the general results here obtained give points lying very 

 approximately on the supersolubility curves already determined by the previous 

 experiments on the refractive indices. 



V. Verification of the Supersolubility Curves by Experiments witli Sealed Tubes. 



In order to verify the three supersolubility curves obtained above for the three 

 modifications of monochloracetic acid a, ft, and y, another series of experiments was 

 undertaken in which aqueous solutions of the acid of various concentrations were 

 enclosed in sealed tubes and heated in water to about 80 until all the crystals had 

 dissolved. The tubes were then allowed to cool very gradually in a large beaker aud 

 were attached to glass rods, by means of which they could be shaken by hand as they 

 cooled. They were always shaken violently throughout the whole process of cooling, 

 and the temperature at which crystals first formed in a tube was noted for each tube 

 in turn. The crystals which formed were immediately examined under the microscope 

 in order to ascertain which modification had separated. 



