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



bases and of sulphuric acid, tartaric acid, racemic acid, oxalic and 

 phosphoric acid. 



3. Fluid from unopened pitcher-plants grown in the Experi- 

 mental Gardens, Edinburgh, June 13th, 1849. 



The water was perfectly clear and colourless, had an acid re- 

 action on litmus paper, and exhibited the same physical and che- 

 mical characters as the fluid from the pitcher-plants of the Bota- 

 nical Garden. 



63"21 grains of water left on evaporation a residue which, dried 

 at 312° F., amounted to 



0*58 grain. 

 100 parts of the fluid therefore contained 



0*91 per cent, of dry residue. 



Exposed to a red heat the residue (0'58 gr.) turned black, and 

 gave off pungent fumes, and left a white ash after all the char- 

 coal was completely burnt away, the weight of which was 0*42 

 of a grain. 



The loss by burning therefore was 25'86 per cent. 



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 M^as 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. 



