7 ▁British ▁Association ▁report . ▁ ▁As ▁part ▁of ▁his ▁investig ations , ▁Hop kins ▁sought ▁to ▁quant ify ▁the ▁effects ▁of ▁enorm ous ▁press ures ▁on ▁the ▁mel ting ▁point ▁and ▁thermal ▁conduct ivity ▁of ▁various ▁subst ances . ▁With ▁the ▁support ▁of ▁a ▁grant ▁from ▁the ▁Royal ▁Society , ▁he ▁invoked ▁the ▁assistance ▁of ▁Thom son , ▁James ▁Pres c ott ▁J ou le ▁and ▁William ▁Fair b air n ▁to ▁make ▁measurements ▁which ▁he ▁interpreted ▁as ▁supporting ▁his ▁theory . ▁He ▁further ▁assert ed ▁that ▁the ▁cool ing ▁of ▁the ▁Earth ▁had ▁had ▁no ▁real ▁impact ▁on ▁climate . ▁He ▁read ▁a ▁paper ▁to ▁the ▁Ge ological ▁Society ▁On ▁the ▁C aus es ▁which ▁may ▁have ▁produced ▁changes ▁in ▁the ▁Earth ' s ▁super f icial ▁Tem per ature ▁( 1 8 5 1 ). ▁In ▁his ▁second ▁address ▁as ▁president ▁of ▁the ▁Ge ological ▁Society ▁of ▁London ▁( 1 8 5 3 ) ▁he ▁critic ised ▁El ie ▁de ▁Be aum ont ' s ▁theory ▁of ▁the ▁elev ation ▁of ▁mountain - ch ains ▁and ▁the ▁imper fect ▁evidence ▁on ▁which ▁he ▁saw ▁it ▁as ▁rest ing . ▁ ▁Ult imately , ▁it ▁was ▁Thom son ▁who ▁tact fully ▁pointed ▁out ▁that , ▁though ▁Hop kins ' s ▁conclus ions ▁about ▁the ▁Earth ' s ▁structure ▁were ▁correct , ▁his ▁mathematical ▁and ▁physical ▁reasoning ▁was ▁uns ound . ▁ ▁Gla ci ology ▁Hop kins ▁wrote ▁also ▁on ▁the ▁motion ▁of ▁gla ci ers ▁and ▁the ▁transport ▁of ▁gla cial