132 Dr. A. Voelcker on the Chemical Composition of the 



The residue left on evaporation of this fluid was slightly co- 

 loured, and gave an almost colourless solution with water. A 

 portion of this solution was kept in a closed bottle. After the 

 lapse of a fortnight the water in the bottle became turbid and 

 deposited some light white flakes. The acid reaction, which was 

 very distinct before, had now disappeared entirely. 



4. Fluid from opened pitcher-plants grown in the Experi- 

 mental Gardens, June 14th, 1849. 



The fluid in the open pitchers was coloured yellow, but other- 

 wise perfectly clear. The reactions with chemical tests were the 

 same as the preceding. 



97*74 grains of water left on evaporation 0*85 of a grain of 

 dry residue. 



100 parts therefore contained 0*87 per cent, of solid matter. 



This residue was coloured yellow, but redissolved entirely in a 

 little water. 



5. Fluid from unopened pitcher-plants grown in Messrs. 

 Dickson's nursery, June 17th, 1849. 



Fluid perfectly clear and colourless, reactions the same as above. 

 319*48 grains left a residue which, dried at 212° F., was found 

 to weigh 1*88 grain ; or 



100 parts of the liquid contained 0*58 per cent. 



6. Liquid from unopened pitcher-plants grown in Messrs. Dick- 

 son's nursery, June 21st, 1849. 



Physical and chemical characters of the liquid the same as 

 above. 



193*82 grains of water left on evaporation 1*22 grain of dry 

 residue, or 0*62 per cent. 



When burnt the 1*22 grain lost in weight 0*44 .of a grain, 

 or 100 parts of the residue lost 3606 per cent. 



The solid matter of this liquid was very hygroscopic, and co- 

 loured more yellow than that of the Botanical and Experimental 

 Gardens. 1 found that the total weight of the solid matter in this 

 fluid was not so large as in that of the Experimental Gardens, but 

 that the proportion of organic matter in the residue was larger 

 than that in the residue of the fluid procured from the Experi- 

 mental Gardens. 



7. Water from opened pitcher- plants grown in Messrs. Dick- 

 son's nursery, June 24th, 1849. 



This fluid was yellow-coloured and not quite clear. Litmus 

 paper was turned red when moistened with the water. The re- 

 actions were the same as above, with the exception that nitrate of 

 barytes produced a slight turbidity, indicating the presence of 

 sulphuric acid. As I found no sulphuric acid in the liquid from 

 the unopened pitchers of the same plants, nor in any of the 

 liquids I examined, I think the sulphuric acid which I found 



