ALBUMIN : THE ISO-ELECTRIC REACTION 21 



Table 2. 

 Effect of Addition of Acids and Bases. 



(Time 6 hours in all cases.) 



Table 3. 

 Effect of Addition of Salts. 



(Time 6 hours.) 



The investigation was made more sensitive later on by the 

 construction of a more perfect apparatus * for detecting move- 

 ment in the electric field. We will now describe this apparatus, 

 as it is capable of wide application. 



A large U-tube is provided with a tap in the middle of each 

 limb, and near the top of each limb two other U -tubes, about 

 half as big as the central one, are fused on as shown. These two 

 tubes are joined at their lowest points by a tube also provided 

 with a tap. The large U-tube can be fitted from the bottom at 

 C. It is charged in this way with the colloid under examination 



* C. Landsteiner and Wo. Pauli, " 25 Kongr. f. Innere Medizin, 

 1908." 



