Buffalo wrote:Really? How would one conclude which technologies were not present in a given civilization (or indeed which civilizations were not present in a given time/region), if not through absence?
The question of absence isn't very interesting until there is a reason to question it. In most cases it is a question of the conflict between a text and the dirt archaeology. Until that occurs, absence is absence and there is no more reason to speculate that something hasn't been found than there is to posit that what has been found is the result of aliens.
When a text is involved, we have different questions. Texts and dirt archaeology have an uneasy interface. The texts are more detailed, but sometimes the dirt tells us that the text's precision is not accurate. It turns out that a lot of ancient writers had the same PR talents that modern politicians do, and that they describe the world to fit their vision, not necessarily reality.
So, if a text says that something existed and it isn't in the dirt, it becomes a question of interest. That is when absence in and of itself doesn't yet say anything, just like the unsupported text doesn't tell us anything. It is a question to be settled later.
What can be done with a text is to deal with other issues that would tell us whether to worry about an unsupported item. If nothing in the text matches history, then the absence in the dirt becomes corroboration. If much of the text fits the historical circumstances, then we have to wait to find out how the text and dirt will eventually work out the issue.