I have usually given acknowledgements along with notes and references, but it is appropriate to mention some people here to whom I am indebted for putting themselves out on my behalf. If there are some I have missed, I hope they will forgive me.

Norman Cardwell and William O'Kane in Dungannon were helpful when I was on the trail of JJ in his youth; also Winnie Acheson in tracking down the early Johnston residences. Kate Targett in the Plunkett Foundation, Oxford, unearthed many of his early co-operative studies. The librarians in the Lincoln archive and Bodleian Library in Oxford were helpful, also Gary Peatling and Roy Foster, the latter by encouraging me to think that my own memoir might be important. In Dublin the TCD Library MS room staff were helpful with the TCD Board minutes. The Central Office of Statistics in Rathmines, which holds the SSISI archive, was helpful with this. Plunkett House in Merrion Square (Dublin) was a helpful source of early co-operative movement publications to which JJ had contributed.

Ron Barrington (Greystones) was helpful with the Barrington Trust Archive, and RD Collison Black in Belfast gave useful insights, including the Salim Rachid contact in Illinois (Berkeley and the 'Irish School of Development Economics'). Tom Garvin in UCD deserves thanks for taking on the re-publication in 1999 of JJ's 1913 Civil War in Ulster.

John Killen in the Linen Hall Library, Belfast, deserves thanks for taking on board the archived source material. Maurice Laheen in Tuam was helpful with the RM Burke episode, and Prionnsias O Drisceoil in Kilkenny with the reports of the 1950s debates. Thanks are due to Ed Hagan for insights into Standish O'Grady.

Paul O'Higgins was helpful with insights into, and recollections of, the 1940s student Left. I am particularly indebted to Anthony Coughlan for enabling access to the Desmond Greaves Diaries, and the Wolfe Tone Society archive; these, I understand, he hopes to donate to the National Library of Ireland in due course.

I am indebted to Tomas Mac Giolla, Sean Garland and the Workers Party head office staff in Hill St, Dublin, for access to the 1960s Sinn Fein minutes. There is much archive material there relating to the 1960s politicisation process which remains to be accessed and analysed by historians. I had however to depend on the Ulster Quaker historian Roy Garland (no relation of Sean G) for a version of the (Sean) Garland Commission Report. Roy Garland has been studying loyalist-republican political interactions.

Mick Ryan (Dundalk) also deserves thanks in this context, as do Shay Courtney (Dublin) and Sean Swan (Belfast). The late Derry Kelleher should be thanked posthumously for making available his file of Nuacht Naisiunta, which ran from September 1969 up to the mid 1970s; this is now with the WP archive. Thanks also to Matt Treacy (TCD) for some National Archive material, including the 1965 'captured documents'.

I should thank Douglas Gageby for the opportunity to develop my 'science and technology' column in the Irish Times which ran from 1970 to 1976, providing me with the opportunity to ease myself constructively out of the political front-line when the latter became dominated by the pathology of violence. In this context I also owe gratitude to Gordon Foster for opening the possibility of constructive work at the university-industry interface.

I owe thanks to Brenda Swann for enabling my participation in the omnibus JD Bernal biography, published by Verso in 1999, which she edited. This ensured a significant Bernal input to subsequent books on Irish-rooted scientific achievements.

Finally, thanks to Brian Ennis and Sean Breen in IMS (Irish Medical Systems / Interactive Multimedia Systems) for enabling me painlessly to develop the supportive hypertext knowledge-base.

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Copyright Dr Roy Johnston 2003