f 337 ] 



XIV. On the Spontaneous Crystallisation of Monochlor acetic Acid and its 



Mixtures wit/t Naphthalene. 



By Principal HENRY A. MIEKS, F.R.ti., and Miss FLORENCE ISAAC, Research 

 Felloiv of Somerville College, Oxford. 



Received January 26, Read February 18, 1909. 



CONTENTS. 



Page 



Introduction preliminary experiments on mixtures of naphthalene and monochloracetic acid . 338 



PART I. MONOCHLORACETIC ACID AND ITS AQUEOUS SOLUTIONS. 



A. The different modifications of monochloracetic acid 340 



a-modification 311 



/3-modification 341 



/-modification 342 



B. Transformations of the modifications of monochloracetic acid . . . '. 342 



Transformations of 7 342 



Transformation of /3 343 



C. Aqueous solutions of monochloracetic acid 343 



Method of experimenting by observation of refractive indices 343 



Solutions giving an a-shower 345 



Solutions giving a /3-shower 345 



Solutions giving a y-shower 349 



I. Tabulated results of solutions of various concentrations first giving a-showers leading to 



the a-supersolubility curve 350 



II. Tabulated results of solutions first giving /3-showers leading to the /J-supersolubility 



curve 353 



III. Tabulated results of solutions first giving y-showers leading to the y-supersolubility 



curve 356 



IV. Monochloracetic acid stirred in an open vessel 359 



V. Verification of the supersolubility curves by experiments with sealed tubes 360 



1. Tubes giving a-showers 362 



2. Tubes giving /3-showers < 362 



3. Tubes giving y-showers 363 



4. Outlying points 363 



VOL. CCIX, A 454. 2 X 27.5.09 



