The question is easily answered - It didn't exist.
So why the long piece about knowledge, its accumulation, sorting, selecting, losing, etc etc?
The author also ends with
'There is all too little danger of the knowledge currently accumulating in floods - multiply-owned, stored and captured - being lost. Rather, if we are going to make sense for posterity of today's information-saturated present, one of the things we will have to learn to do is decide how to prune the evidence, and ultimately, what to forget.'