ON THE BOILING POINTS OF AQUEOUS SOLUTIONS OF ELECTROLYTES. 209 



means of a screw arrangement at B. The screw is so constructed as to press against 

 a little cushion of rubber, which presses against the glass tube, and may be made to 





//-// 



Fig. 6. 



do so as firmly as desired. The tubes F and F had shoulders below the stopper C 

 and C, to prevent the stoppers from sliding down. The wires to the bridge are, as in 

 TRANS. ROY. SOC. EDIN., VOL. XLV. PART I. (NO. 8). 29 



