MINERALS. 
3 47 
the dog is held above this mark he does not seem 
to feel the smallest inconvenience ; but when his 
head is thrust down lower, he struggles to get free 
for a little ; but in the space of four or five minutes 
he seems to lose all sensation, and is taken out 
seemingly without life. From this perilous situa- 
tion, however, he quickly recovers, on being plunged 
into the neighbouring lake ; from whence he is 
permitted to run home and remain till his turn 
pomes round again. 
