. ▁ ▁Publications ▁ ▁Books ▁author ed ▁by ▁Ac worth ▁include : ▁▁ 1 9 2 9   – ▁This ▁Bond age : ▁A ▁Study ▁of ▁the ▁" M igration " ▁of ▁Bird s , ▁In sect s , ▁and ▁A ircraft , ▁with ▁some ▁Ref lections ▁on ▁" E volution " ▁and ▁Rel ativity . ▁▁▁ 1 9 3 0   – ▁The ▁Nav ies ▁of ▁Today ▁and ▁Tom orrow . ▁A ▁Study ▁of ▁the ▁Naval ▁Cris is ▁from ▁Within . ▁E y re ▁and ▁Sp ott is wo ode : ▁London . ▁▁ 1 9 3 2   – ▁Back ▁to ▁the ▁Co al ▁Standard : ▁The ▁Future ▁of ▁Transport ▁and ▁Power . ▁E y re ▁and ▁Sp ott is wo ode : ▁London . ▁▁ 1 9 3 4   – ▁The ▁Navy ▁and ▁the ▁Next ▁War . ▁A ▁V ind ic ation ▁of ▁Sea ▁Power . ▁E y re ▁and ▁Sp ott is wo ode : ▁London . ▁▁ 1 9 3 4   – ▁This ▁Progress : ▁The ▁T rag edy ▁of ▁E volution . ▁Rich ▁& ▁Cow an : ▁London . ▁▁ 1 9 3 5   – ▁The ▁Rest oration ▁of ▁England ’ s ▁Sea ▁Power . ▁E y re ▁and ▁Sp ott is wo ode : ▁London . ▁▁ 1 9 3 7   – ▁Britain ▁in ▁D anger : ▁An ▁Ex am ination ▁of ▁Our ▁New ▁Navy . ▁▁ 1 9 4 0   – ▁How ▁the ▁War ▁Will ▁Be ▁W on . ▁E