The second alone is now our sense impression.
Yet this second act is in itself meaningless if it is not supported by the first.

Hence the first must somehow be in our consciousness.

At least in every important scene we must remember those situations of the preceding act which can throw light on the new developments.

We see the young missionary in his adventures on his perilous journey and we remember how in the preceding act we saw him in his peaceful cottage surrounded by the love of his parents and sisters and how they mourned when he left them behind.

The more exciting the dangers he passes through in the far distant land, the more strongly does our memory carry us back to the home scenes which we witnessed before.