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4-1 The History of Cell
Biology
The Discovery of Cells

Cell – the smallest
unit of life that can
carryout all of the
processes of life
The Discovery of Cells

Robert Hooke
The Discovery of Cells
Robert Hooke
 English Scientist

The Discovery of Cells
Robert Hooke
 English Scientist
 1665 – first person to
see cells
 looked at cork under
a microscope and saw
little boxes; called
them “Cells”

The Discovery of Cells

Anton van
Leeuwenhoek
The Discovery of Cells
Anton van
Leeuwenhoek
 Dutch trader; made
microscopes

The Discovery of Cells
Anton van
Leeuwenhoek
 Dutch trader; made
microscopes
 1673 – saw first living
organisms in pond
water; called them
“animalcules”

The Discovery of Cells

Matthias Schleiden
The Discovery of Cells
Matthias Schleiden
 German Botanist

The Discovery of Cells
Matthias Schleiden
 German Botanist
 1838 – first to say all
plants are composed
of cells

The Discovery of Cells

Theodor Schwann
The Discovery of Cells
Theodor Schwann
 German zoologist

The Discovery of Cells
Theodor Schwann
 German zoologist
 1839 – first to say all
animals composed of
cells

The Discovery of Cells

Rudolf Virchow
The Discovery of Cells
Rudolf Virchow
 German physician

The Discovery of Cells
Rudolf Virchow
 German physician
 1855 – first to say
Cells come from other
cells

The Discovery of Cells

The Cell Theory
The Discovery of Cells

The Cell Theory
1. All organisms are made of cells
The Discovery of Cells

The Cell Theory
1. All organisms are made of cells
2. Cells are the most basic unit of life
The Discovery of Cells

The Cell Theory
1. All organisms are made of cells
2. Cells are the most basic unit of life
3. Cells come only from other living cells
The Discovery of Cells

The Cell Theory
1. All organisms are made of cells
2. Cells are the most basic unit of life
3. Cells come only from other living cells
(Schleiden, Schwann, and Virchow)
The Discovery of Cells
Theory - a well-substantiated explanation of
some aspect of the natural world that is
acquired through the scientific method and
repeatedly tested and confirmed through
observation and experimentation.