"Between us there was, as I have already said somewhere, the bond of the sea"

This refers to the second paragraph of 'Youth':

We all began life in the merchant service. Between the five of us there was the strong bond of the sea, and also the fellowship of the craft ...

 

Youth: A Narrative and Two Other Stories (1902 first edition)
Public DomainYouth: A Narrative and Two Other Stories (1902 first edition) - Credit: William Blackwood and Sons

Heart of Darkness was originally serialised in Blackwood’s Magazine, from February to April 1899, under the title ‘The Heart of Darkness’. ‘Youth’ had appeared in the September 1898 issue. The two were subsequently published by Blackwood’s in book form, along with ‘The End of the Tether’, as Youth: A Narrative; and Two Other Stories in 1902.