180 DROSEKA ROTUNDIFOLIA. Chap. VIII. 



a solution of one part to 875 of water, produced no apparent 

 effect. They were then treated with the same solution of car- 

 bonate of ammonia, with the same result as in the case of the 

 nitrate of potash. 



Fotassium, Phosphate of. — Half-minims of a solution of one 

 part to 437 of water were placed on the discs of six leaves, 

 which were observed during three days ; but no effect was pro- 

 duced. The partial drying up of the fluid on the disc slightly 

 drew together the tentacles on it, as often occui's in experi- 

 ments of this kind. The leaves on the third day appeared quite 

 healthy. 



Fota^siuin, Citrate of. — Half-minims of a solution of one part 

 to 437 of water, left on the discs of six leaves for three days, 

 and the immersion of three leaves for 9 hrs., each in 30 minims 

 of a solution of one part to 875 of water, did not jDroduce the 

 least effect. 



Fotassium, Oxalate of. — Half-minims were placed on different 

 occasions on the discs of seventeen leaves ; and the results per- 

 plexed me much, as they still do. Inflection supervened very 

 slowly. After 24 hrs. four leaves out of the seventeen were well 

 inflected, together with the blades of two; six were slightly 

 affected, and seven not at all. Three leaves of one lot were 

 observed for five days, and all died; but in another lot of 

 six, all excepting one looked healthy after four days. Three 

 leaves were immersed during 9 lirs., each in 30 minims of 

 a solution of one part to 875 of water, and were not in the 

 least affected; but they ought to have been observed for a 

 longer time. 



Fotassium, Chloride of. Neither half-minims of a solution of 

 one imrt to 437 of water, left on the discs of six leaves for three 

 days, nor the immersion of three leaves during 25 hrs., in 

 30 minims of a solution of one part to 875 of water, produced 

 the least effect. The immersed leaves were then treated with 

 carbonate of ammonia, as described under nitrate of potash, and 

 with the same result. 



Fotassium, Iodide of. — Half-minims of a solution of one part 

 to 437 of water were placed on the discs of seven leaves. In 

 30 m. one leaf had the blade inflected ; after some liours three 

 leaves had most of their submarginal tentacles moderately in- 

 flected; the remaining three being very slightly affected. 

 Hardly any of these leaves had their outer tentacles inflected. 

 After 21 hrs. all re-expanded, excepting two which still had a 

 few submarginal tentacles inflected. Three leaves were next 



