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Hans and Zacharias Janssen: produced the first compound microscope by combining two convex lenses within a tube.
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He strongly agreed with abiogenesis. He thought it you left out a bucket of wheat it would make mice.
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He dicovered that if you do not allow flies to land on meat maggots will not appear. Also he developed controlled biological experiments.
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A new book, Micrographia, published in 1665 by
English scientist Robert Hooke (1635-1703), shows
drawings of once-living matter (the lining of
tree bark) as observed with a compound
microscope. -
Designed his own microscopes to examine specimens
for himself. He designed simple, tiny microscopes. -
Learns of Needham’s experiment and repeats it only
boils the broth much longer. The sealed flask doesn’t
become cloudy days later. Also people who still believe in spontanios generation say that the boiling destroys the element that it needs to make life. -
He stated that growth results from both the increase in he volume of cells and from the addition of new little cells. He recognized that chlorophyll was necessary for photosynthesis.
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1838 writes “All plants are made of cells."
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Writes “all animals are made up of cells”
Schwann also modifies and expands Schleiden’s work
to say that “Cells are organisms, and entire animals
and plants are collectives of these organisms.” -
He was the first scientist to prove that cells can only form from pre-existing cells. He did this by creating an experiment that showed cells would only grow in broth if air was exposed.
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Writes, “Cells are the last link in a great
chain that forms tissues, organs, systems, and
individuals…where a cell exists, there must have
been a pre-existing cell…Throughout the whole
series of living forms…there rules an eternal law
of continuous development.” -
He built first transmission microscope.
