Observation
On examining the areas where bacterial growth has occurred we find that:-
- the colonies of the non-motile bacteria remain confined within the tube at the site of inoculation
- the motile bacteria swim out from the bottom of the tube and colonize the surrounding medium as well
Confirmation may be obtained by subculture and retesting.
Read more about this topic: Cragie Tube
Famous quotes containing the word observation:
“That observation which is called knowledge of the world will be found much more frequently to make men cunning than good.”
—Samuel Johnson (1709–1784)
“One man’s observation is another man’s closed book or flight of fancy.”
—Willard Van Orman Quine (b. 1908)
“It is, in both cases, that a spiritual life has been imparted to nature; that the solid seeming block of matter has been pervaded and dissolved by a thought; that this feeble human being has penetrated the vast masses of nature with an informing soul, and recognised itself in their harmony, that is, seized their law. In physics, when this is attained, the memory disburthens itself of its cumbrous catalogues of particulars, and carries centuries of observation in a single formula.”
—Ralph Waldo Emerson (1803–1882)