Column 1 :  Salts causing inflection.  Column 2 :  Salts not causing inflection.

(Arranged in Groups according to the Chemical Classification in Watts’ ‘Dictionary of Chemistry.’)

Sodium iodide, rather slow inflection. :  Potassium iodide, a slight and doubtful amount of inflection.  Sodium bromide, moderately rapid inflection. :  Potassium bromide.  Potassium oxalate, slow and doubtful inflection. :  Lithium nitrate, moderately rapid inflection. :  Lithium acetate.  Caesium chloride, rather slow inflection. :  Rubidium chloride.  Silver nitrate, rapid inflection:  quick poison. :  Cadmium chloride, slow inflection. :  Calcium acetate.  Mercury perchloride, rapid inflection:  quick poison. :  Calcium nitrate.
 :  Magnesium acetate. :  Magnesium nitrate. :  Magnesium chloride. : 
 Magnesium sulphate. :  Barium acetate. :  Barium nitrate. :  Strontium
 acetate. :  Strontium nitrate. :  Zinc chloride.

Aluminium chloride, slow and doubtful inflection. :  Aluminium nitrate, a trace of inflection.  Gold chloride, rapid inflection:  quick poison. : Aluminium and potassium sulphate.

Tin chloride, slow inflection:  poisonous. :  Lead chloride.

Antimony tartrate, slow inflection:  probably poisonous.  Arsenious acid, quick inflection:  poisonous.  Iron chloride, slow inflection:  probably poisonous. :  Manganese chloride.  Chromic acid, quick inflection:  highly poisonous.  Copper chloride, rather slow in flection:  poisonous. :  Cobalt chloride.  Nickel chloride, rapid inflection:  probably poisonous.  Platinum chloride, rapid inflection:  poisonous. [page 176]

Sodium, Carbonate of (pure, given me by Prof.  Hoffmann).—­Half-minims (.0296 ml.) of a solution of one part to 218 of water (2 grs. to 1 oz.) were placed on the discs of twelve leaves.  Seven of these became well inflected; three had only two or three of their outer tentacles inflected, and the remaining two were quite unaffected.  But the dose, though only the 1/480 of a grain (.135 mg.), was evidently too strong, for three of the seven well-inflected leaves were killed.  On the other hand, one of the seven, which had only a few tentacles inflected, re-expanded and seemed quite healthy after 48 hrs.  By employing a weaker solution (viz. one part to 437 of water, or 1 gr. to 1 oz.), doses of 1/960 of a grain (.0675 mg.) were given to six leaves.  Some of these were affected in 37 m.; and in 8 hrs. the outer tentacles of all, as well as the blades of two, were considerably inflected.  After 23 hrs. 15 m. the tentacles had almost re-expanded, but the blades of the two were still just perceptibly curved inwards.  After 48 hrs. all six leaves were fully re-expanded, and appeared perfectly healthy.

Three leaves were immersed, each in thirty minims of a solution of one part to 875 of water (1 gr. to 2 oz.), so that each received 1/32 of a grain (2.02 mg.); after 40 m. the three were much affected, and after 6 hrs. 45 m. the tentacles of all and the blade of one closely inflected.