398 O N O P I U M. 



LETTUCE OPIUM. COMMON OPIUM. 



JExPERIMENT 2 I . 



I added 20 drops to a diluted folu- 

 tion of •nilrat of copper. The green 

 colour of the latter, predominated; 

 but a very lightilh bro\^ii coloured 

 precipitate gradually fubfided. 



EyLfERlMENT 23. 



A copious lightifli brown coloured 

 precipitate was produced by adding 

 20 drops, to a diluted folution of «i- 

 irat of mercury. 



F.XPERIMENT 25. 



yllLcho), diluted with water, pro- 

 duced no effeft when added to the 

 above folution. 



EXFERIMENT 22. 



In this experiment the browa 

 colour of the folution of opium pre- 

 dominated, and a beautiful clear fo- 

 lution remained which did not become 

 cloudy after flanding lo minutes. 



Experiment 24, 



A fimilar eflFed took place in this 

 experiment. 



Experiment 26. 

 This experiment proved the fame. 



As in the above related experiments, the general effeds 

 of the tivofpecies of opium were pretty nearly fimilar, with 

 chemical tefls; I thought a fet oi comparative experiments 

 made upon frogs, would be proper to illuftrate ftill farther 

 this identity. I therefore fubmitted feveral to the adlion of 

 the opium in the manner following. 



Experiment 27. 



July ift. In a vial (C) I put 8 grains of the opium lac- 

 iuco'., and added by meafure half an ounce of good brandy. 

 On the 14th of Auguft, I filtered it, and found 2 grains 

 left upon the filtre. This I put into the fame vial C. and 

 added half an ounce of filtered i-ain water. The mafs was 

 of a gummy nature, pofl'efling nothing of the peculiar tajie of 

 opium, and but little oiihc fmell. On the i6th, after fil- 

 tering it, I ftill found 2 grains remaining. The water had 



acquired 



