1886. | Psychology. 827 
quite one three-billionth of a grain, is capable of calling out a 
nerve impulse. This subdivision of matter is quite beyond com- 
prehension, yet the nose alone can appreciate it. The smallest 
subdivision appreciable by the eye through the spectroscope is 
I-1,400,000 milligramme of sodium, which is a two hundred and 
fifty times coarser division of matter than the minimum of odor- 
exciting mercaptan. 
On account of the extraordinary power of mercaptan it is pro- 
posed to put it to some practical use in testing currents of air, 
ventilation, etce.— Medical Record. 
PSYCHOLOGY. 
CaninE ReEason.—S. N. Maxcy, of Gardiner, Maine, has a 
black-and-tan dog which is very intelligent. He has all the ac- 
complishments a common dog has and knows several besides. 
The screen door of the house opens outward, and Dick can open 
it from the outside, pulling it with his teeth. The other day he 
approached the door with a bone in his mouth. He couldn't 
open the door while he held the bone, and if he couldn’t have the 
bone he didn’t care to open it. He looked at it a minute, then 
laying the bone down near the door, pulled the door open and went 
in, He then turned and pushed the door wide open, and before it 
could swing to again, had grabbed up his bone and got inside.— 
Exchange, 
A bird dog owned in this town, though we doubt much if he 
been shot over, is in the habit of making furious dashes at 
the doves feeding in the streets, and of course the birds are too 
quick for him. The other day he watched his opportunity in this 
wise. The dog saw the doves, and also saw a team approaching ; 
he waited until the team was between himself and the birds, then 
€ made a tremendous rush between the wheels, and the birds 
Not seeing his first leap were taken in a heap of surprise, and one 
dove was nearly captured, : 
eg these cases look a trifle like an exercise of the reasoning 
wer, 
_ Since the above was written (it was prepared for last week’s 
issue) another capital story has come to our knowledge. Dr. C. 
A. Packar d, of Bath, owns a setter of very fine blood, when young 
` capital bird dog, but too old now to hunt. He runs with the 
carriage for short drives occasionally. One day when on the road 
poor “ Flash” had the misfortune to nearly tear out one of his 
nails, and the doctor was obliged to use the bone forceps to re- 
move the nail. Flash stood the operation “like a major,” never 
wincing. Not long after this the doctor heard the well-recog- 
_ ized rap of Flash on the office door for admission. It was opened 
and in came Flash, accompanied by a small dog with a bad 
Wound upon one leg, and Flash brought the dog up before his 
