Little Tim was in the garden filling in a hole when his neighbor peered over the fence.
Interested in what the cheeky-faced youngster was up to, he politely asked, "What are you up to there, Tim?"
"My goldfish died," replied Tim tearfully, without looking up, "and I've just buried him."
The neighbor was concerned, "That's an awfully big hole for a goldfish, isn't it?"
Tim patted down the last heap of earth then replied, "That's because he's inside your stupid cat."
Matthias Jakob SchleidenDied 23 Jun 1881 at age 77 (born 5 Apr 1804).German botanist who first formulated the theory that plants are composed of cells. Instead of plant classification, Schleiden studied plant growth and structure under the microscope. This led to his Contributions to Phytogenesis (1838), which stated that the various structures of the plant are composed of cells or their derivatives. He thus formulated the cell theory for plants, which was later eleborated and extended to animals by the German physiologist Theodor Schwann. Schleiden recognized the significance of the cell nucleus and sensed its importance in cell division, although he thought (wrongly) that new cells were produced by budding from its surface. He was one of the first German biologists to accept Darwinism. |
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