He could not add 7 and 5, or any two numbers whereof 6, 7, or 8 formed a part, for he could not call them to mind. Other numbers he knew well. He could no longer tell time by the watch.
For a week after the beginning of this curious condition he did not recognize his surroundings. On going out for the first time the streets of the city no longer seemed familiar; on coming back he did not know his own house. After a few weeks, however, all his memories had returned excepting those of the letters and figures named; but as the loss of these put a stop to his reading, and to all his business life, the small defect of memory was to him a serious thing.
Experience has shown that such a defect is due to a small area of disease in one part of the brain.—Harper’s Weekly.
(2007)
Memory Elusive—See [Heads, Losing].
MEMORY FACULTY IN FISHES
Experiments recently made at Tortugas show that fishes have the faculty of remembering for at least twenty-four hours.
The fish studied at Tortugas are gray perch, whose favorite food is the little silver sardine. The experimenters painted some of the silver sardines light red; then they offered them to the gray perch mixed with the unpainted sardines. The perch snatched the silver sardines and ate them, then very deliberately and cautiously they nibbled at the painted sardines. Finding that the fish were the same whether red or silver, they devoured the red fish.
Having given proof of their intelligence, they were permitted to rest twenty-four hours. The experimenters offered them silver sardines, sardines painted red, and sardines painted blue. The perch quickly devoured the silver fish, then, without an instant’s hesitation, they devoured the red fish. Finally, gliding cautiously up to the blue fish, they took a bite and darted away. As the taste was favorable they returned to the blue fish, nibbled again, and devoured them.
The experimenters then tied sea-thistles to the blue sardines. The perch nibbled, then, disagreeably surprized, darted away. For twenty-four hours not a fish approached the painted blue fishes. They remembered the sea-thistles. But their memory is short; the day following again they snatched the blue fish.—Harper’s Weekly.