With all your powers you must live at the whim of other cultures.
"Cultures skid backwards when they're transplanted," the Captain said.
Compare the naked-eye appearances of the cultures from day to day.
You see, what Thurston didn't realize was that his cultures were contaminated.
Great cities have always been the melting-pots of races and of cultures.
Assimilation, on the other hand, is limited to the fusion of cultures.
Each of these cultures was afflicted with a different disease.
Civilization has always been accentuated at points where cultures could cross.
There are several varieties, which can be distinguished only in cultures.
In rare instances it may be necessary to resort to cultures.