" Beware of determining and declaring your opinion suddenly on any object; for imagination often gets the start of judgment, and makes people believe they see things, which better observations will convince them could not possibly be seen; therefore assert nothing till after repeated experiments and examinations in all lights and in all positions.
When you employ the microscope, shake off all prejudice, nor harbor any favorite opinions; for, if you do, ‘tis not unlikely fancy will betray you into error, and make you see what you wish to see.
Remember that truth alone is the matter that you are in search after; and if you have been mistaken, let not vanity seduce you to persist in your mistake.
Pass no judgment upon things over-extended by force, or contracted by dryness, or in any manner out of their natural state, without making suitable allowances.
There is no advantage in examining any object with a greater magnifier than what shows the same distinctly..."
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