142 



DROSERA ROTUNDIFOLIA. [Chap. VIIL 



CHAPTER Vin. 



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. 



Having 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 iTfFLitCTiox. 



Salts not cAxrsnro Iwtlection. 



lArranged in Groups according to tfu Chemical Clasti/leatton in Wattt^ 

 ' Dictionary of Chemistry.') 



Sodinm carbonate, rapid inflec- 

 tion. 

 Sodium nitrate, rapid inflection. 



Sodium sulphate, moderately 

 rapid inflection. 



Sodium phosphate, very rapid In- 

 flection. 



Sodium citrate, rapid Inflection. 



Sodium oxalate, rapid Inflection. 



Sodium chloride, moderutelf 

 rapid Inflection. 



Sodium iodide, rather slow Inflec- 

 tion. 



Sodium bromide, moderately 

 rapid Inflection. 



Potanxlum oxninte, slow and 

 doubtful Inflection. 



Potassium carbonate: slowly poi- 

 sonous. 



Potassium nitrate: somewhat poi- 

 sonous. 



Potassium sulphate. 



Potassium phosphate. 



Potassium citrate. 



Potassium chloride. 



Potnsxlum Iodide, a sllirht nnd 



doubtful amount of Inflection. 

 Potassium bromide. 



