142 DROSERA ROTUNDIFOLIA. [Cuar. VIII. 
CHAPTER VIII. 
THE EFFECTS OF VARIOUS SALTS AND ACIDS ON THE LEAVES. 
Salts of sodium, potassium, and other alkaline, earthy, and metallic salts— 
Summary on the action of these salts—Various acids—Summary on their 
action. 
Havine found that the salts of ammonia were so powerful, I 
was led to investigate the action of some other salts. It will 
be convenient, first, to give a list of the substances tried 
(including forty-nine salts and two metallic acids), divided 
into two columns, showing those which cause inflection, and 
those which do not do so, or only doubtfully. My experi- 
ments were made by placing half-minim drops on the discs 
of leaves, or, more commonly, by immersing them in the 
solutions; and sometimes by both methods. A summary of 
the results, with some concluding remarks, will then be 
given. The action of various acids will afterwards be de- 
scribed. 
SALTS CAUSING INFLECTION. SALTS NOT CAUSING INFLECTION. 
(Arranged in Groups according to the Chemical Classification in Watts?’ 
‘ Dictionary of Chemistry.’) 
Sodium carbonate, rapid inflection. Potassium carbonate: slowly poison- 
ous. 
Sodium nitrate, rapid inflection. Potassium nitrate: somewhat poison- 
ous. 
Sodium sulphate, moderately rapid Potassium sulphate. 
inflection. 
Sodium phosphate, very rapid in- Potassium phosphate. 
flection. 
Sodium citrate, rapid inflection. Potassium citrate. 
Sodium oxalate, rapid inflection. 
Sodium chloride, moderately rapid Potassium chloride. 
inflection. 
Sodium iodide, rather slow inflection. Potassium iodide, a slight and doubt- 
ful amount of inflection, 
Sodium bromide, moderately rapid Potassium bromide. 
inflection. 
Potassium oxalate, slow and doubtful 
inflection. 
