228 
Hind . — Studies in Permeability . III. 
Sidphuric Acid. 
Series 5. — Similar experiments were made with sulphuric acid as with 
hydrochloric and nitric acids. The change in conductivity of the external 
N N N N N 
solution, when solutions of strengths — , — , — , — , and 
were used, are shown graphically in Fig. 4. It will be observed that the 
general results are similar to those given with hydrochloric and nitric acids. 
Oxatic Acid. 
Series 6 . — The absorption of oxalic acid by potato tissue was investi- 
N N N 
gated in the cases of solutions of concentrations , , . The 
53 500 1000 5000 
change which takes place in the conductivity of the external solution is 
