On Monoacetate of Glycol, and on the Preparation of Glycol. 433 



This being covered, but kept in connexion with the galvano- 

 meter, the polarization gradually diminished, passed the zero- 

 ]3oint, and took up an opposite deflection of 7°'5 ; the outer pla- 

 tinum being now negative, the effect of sunlight was now to re- 

 duce the o 

 Deflection to .... 3 

 Eed glass, to ... . 6*5 

 Yellow glass, to . . . 6-5 



Blue glass ..... 5 



Fl-'^ 



On September 16, this same cell having been set aside in the 

 interim, with the plates metallically connected, the deflection by 

 polarization was increased by sunlight, the exposed platinum, 

 being negative. 



September 15. Black and polished platinum in glass cell with- 

 out porous cell, the black platiuimi being towards the light, 

 and the plain platinum shaded by it ; the black platinum was 

 positive to the plain. 



o 



Deflection by polarization . . 10 



Sunlight 18 



Blue glass 12 



Yellow glass 11 



After half an hour in connexion with a galvanometer, — 



o 



Deflection by polarization had sunk to . 4 



Sunlight 13 



Blue glass 6 



Yellow glass 4 



Red glass 4 



I 



L. On Monoacetate of Glycol, and on the Prqjaration of Glycol. 

 By Dr. E. Atkinson*. 



N making some experiments with bromide of ethylene, I had 

 occasion to notice the great facility with which that sub- 

 stance acts on certain potash salts soluble in alcohol; and at 

 the instance of my friend Dr. Debus, T tried its action on ace- 

 tate of potash, expecting to find therein a ready method of pre- 

 paring acetate of glycol, from which glycol may easily be obtained. 



C.HW+2(C''»'0}0)= g;j:o}o' + 2BrK. 



cthvkne Acetate of potash. Acetate of glycol. 



This method would be quite analogous to that by which this 



* Communicated by the Author. 

 Phil. May. S. 4. Vol. IG. No. 109. Dec. 1858. 2 P 



