CONTENTS 



The Shipbuilding Industry in Belfast -Alec. Wilson, J.P.. M.R.I. A. 5 



Some Notes on the Investigation of Prehistoric Dwelling Places of 



Man in N.E. Ireland— H. C. Lawlor, M.R.I. A. ... 31 



The Search for Perpetual Motion — Henry Riddell, M .E..M.I Mech.K. 62- 



Mental and Physical Fatigue- Professor \'ak'nline ... ... 90 



Ulster Spiders collected in 1915 -f. A. Sidney Stendall, Assistant 



Curator, T5elfast Municipal Art Gallery and Museum ... 95 



Annual Report ... .. ... ... ... 102 



Treasurer's Account ... .. ... .. .. io6- 



Exchanges ... ... ... .. ... loT 



Office-bearers and List of Shareholdeis and Members ... ... no 



