Dr Christison on CEnanthe Crocata. 357 
2. On anew Self-Registering Barometer. By Robert Bryson, 
F.R.S. 
Monday, 15th January 1844. 
Dr ABERCROMBIE, Vice-President, in the Chair. 
The following Communications were read :— 
1. On the Vibrations of an Interrupted Mediuni. By Pro- 
fessor Kelland. 
2. On certain Laws of the Resistance of Fluids. By John 
Scott Russell, Esq. 
3. Chemical Examination of the Tagua-Nut, or Vegetable 
Ivory. By Professor Connell. 
Monday, 5th February 1844. 
Sir T. M. BRISBANE, Bart., President, in the Chair. 
The following Communications were read :— 
1. On the Tides of the Firth of Forth, and the East Coast of 
Scotland. By J. 8. Russell, Esq. 
2. Additional Observations as to the Poisonous Properties 
of Ginanthe crocata. By Dr Christison. 
In this paper the Author added a few supplementary observations 
to those made on the alleged poisonous properties of the @nanthe 
crocata, in his paper on the poisonous Umbellifere, read on the 4th 
December last. 
He stated that he had met with other cases of poisoning with this 
plant, recorded by Continental authors, shewing that death may take 
place in an hour,—that so small a quantity as a single tuber, no 
bigger than the finger, has proved fatal,—that the roots are poison- 
ous in some countries, from the beginning of January till the 
middle of October at all events, and probably throughout the whole 
year ; and that Spain may be added to the countries formerly men- 
tioned, where fatal effects have been produced by the plant. 
He next added, that he had recently tried on a dog the effects of 
the juice of a pound of tubers, collected by Dr Pereira on the 16th 
December from the locality of Woolwich; and that no effect, or an 
exceeding slight one only, was produced. 
It was farther observed, that, according to an analysis executed 
in 1830 by MM. Pihan-Duteilay and Cormerais, the activity of the 
roots in French plants depends upon a resin. On proceeding to try 
upon a rabbit the effects of the resin, obtained by their process from 
the Woolwich plants, the author found that, when the resin from 
eight ounces avoirdupois, amounting to 24 grains, was introduced in 
the state of emulsion into the cellular tissue, the animal died in 78 
