POISONS, 231 
It is also to be observed that a very slight degree 
of over-poisoning paralyzes the transmitting system 
as well as the responding one; so that if any one 
should repeat my observation, I must warn him 
against drawing erroneous conclusions from this 
fact. Let him use weak solutions with prolonged 
soaking, and by watching when the voluntary 
motions in the poisoned half first cease, he need 
experience no difficulty in obtaining results as 
decided as it is possible for him to desire. 
12, Cyanide of Potassium.—On Sarsia the first 
effect is to quicken the contractions and then to 
enfeeble them. The animal assumes an elongated 
form, as already described under atropin. Spon- 
taneity ceases very rapidly even in weak solutions; 
and for an exceedingly short time after it has done 
so, the bell continues responsive both to tentacular 
and to direct stimulation. For a long time after 
the bell ceases to respond to any kind of stimula- 
tion, the nervous connections between the tentacles 
and between the tentacles and manubrium remain 
intact, as also do the nervous connections of these 
organs with all parts of the bell. This interesting 
fact is rendered apparent, first, by stimulating a 
tentacle and observing that all the four tentacles 
and the manubrium respond; and, second, by irri- 
tating any part of the neuro-muscular sheet of the 
bell, and observing that while the latter does not re- 
spond both the tentacles and the manubrium retract. 
Recovery from this stage occupies several hours. 
In the case of Tiaropsis the convulsions are, as 
usual, more pronounced, being marked by the occur- 
