1817.] Dr. Richard Watson. 265 
sophical Transactions, and one or two others of inferior conse- 
quence. 
It is very much to be regretted that Dr. Watson did not continue 
to prosecute the science of chemistry, which he had begun to cul- 
tivate with so much ardour, and which his erudition and sagacity 
fitted him so well to have improved, and his elegant style made 
him so well qualified to have explained. 
ARTICLE J]. 
An Essay on the Oopas, or Poison Tree of Java, addressed to the 
Honourable Thomas Stamford Raffles, Lieutenant Governor. 
By Thomas Horsfield, M.D. (Communicated to the Society 
by the President.) 
(Concluded from p. 214.) 
Exper. 15.—Having, by the assistance of the commandant of 
Banjoowangee, obtained from the Island of Bali an arrow, sup- 
posed to be armed with the oopas from Borneo, 1 wounded a dog 
in the muscles of the thigh. On the 10th minute he beeame rest- 
less, attempted to extricate himself, and barked. In 14 minutes 
he extended his tongue, had an increased flow of saliva, shewed a 
disposition to vomit. In 15 minutes he was very much agitated, 
jumping, barking, and making violent efforts to escape; the attempts 
to vomit became more repeated. In 25 minutes he appeared ex- 
chausted and extended his limbs. In 30 minutes the muscles of the 
abdomen were contracted. In 32 minutes he vomited. In 37 
minutes he vomited an excremental matter. In 40 minutes he 
breathed heavily and laboriously ; the muscles acted violently. In 
45 minutes lying exhausted and breathing hastily. In 50 minutes 
he started suddenly and barked. In 55 minutes he cried out 
violently, and having discharged his excrement, after a few inter- 
rupted respirations, he died. On dissection the same appearances 
were observed as after the above related experiments. 
Exper. 16.—1 obtained a small quantity of the oopas of the 
Island of Borneo, which having moistened, and rendered some- 
what fluid with cold water, I applied to a dart, and wounded a dog 
in the usual manner. ‘The first three minutes he appeared little 
affected by the wound. On the fifth minute he shewed symptoms 
of drowsiness, which gradually increased. In six minutes he 
staggered and reeled round. {In 10 minutes the drowsiness re- 
turned, after which he reeled round again. He now had an in- 
creased flow of saliva, and his breathing became quicker. In 12 
minutes he reeled round again with more violence, and trembled. 
On the 14th minute he fell down with violent tremors and extended 
his extremities convulsed: after a short calm, the symptoms re+ 
6 
