TOTAL NITROGEN. 



95 



A is the flask in which the soil has been heated with the sulphuric acid. 

 B is a similar flask containing water and a scrap of granulated zinc so as to 



ensure a steady evolution of steam. This flask is fitted with a safety 



tube so that the pressure in the apparatus can be determined at once 



(by the height of the water in this tube). 

 C is a separating funnel, bent so as to fit properly and containing the 



strong potash solution. 

 D is a bulb on the deliver}- tube, with an arrangement for preventing any 



particles of the solution in A from being carried over by the steam. 

 E is a 50 or 100 c.c. pipette, which acts as a condenser to some extent and 



prevents any standard acid being drawn back if the evolution of 



steam be suddenly stopped. 

 F is an 8oz. conical flask. 

 G is a tube shaped as shown and filled with glass beads through which the 



standard acid has been allowed to run into F. 



