Secondly , the Lost Tales were not

Secondly , the Lost Tales were not all written progressively one after the other in the sequence of the narrative; and (inevitably) my father began a new arrangement and revision of the Tales while the work was still in progress.The Fall of Gondolin was the first of the tales told to Eriol to be composed, and the Tale of Tinuviel the second, but the events of those tales take place towards the end of the history; on the events of the extant texts are later revisions.In some cases nothing earlier than the revised form can now be read;