▁the ▁profess ors ▁received ▁a ▁precise ▁commission ▁in ▁regard ▁to ▁the ▁accomplish ment ▁of ▁his ▁research ▁program . ▁The ▁directions ▁given ▁to ▁C roy ère ▁and ▁his ▁ge odes ists ▁were ▁written ▁by ▁his ▁brother ▁Joseph ▁Nicolas . ▁G mel in ▁wrote ▁the ▁instruction ▁for ▁his ▁own ▁research ▁work ▁in ▁natural ▁history . ▁He ▁received ▁further ▁instructions ▁from ▁the ▁an atom ist ▁Johann ▁Georg ▁Du ver no i ▁( 1 6 9 1 – 1 7 5 9 ), ▁who ▁had ▁been ▁part ▁of ▁the ▁teaching ▁fac ulty ▁in ▁T üb ingen . ▁Among ▁other ▁things , ▁Du ver no i ▁wanted ▁to ▁find ▁out ▁whether ▁the ▁pe op les ▁of ▁Si ber ia ▁could ▁move ▁their ▁ears , ▁whether ▁their ▁u v ulas ▁were ▁simple , ▁or ▁split ▁into ▁two ▁or ▁three ▁parts , ▁whether ▁Si ber ian ▁males ▁had ▁milk ▁in ▁their ▁bre asts , ▁etc . ▁The ▁phys ic ist ▁Daniel ▁Bern oul li ▁( 1 7 0 0 – 1 7 8 2 ) ▁author ed ▁instructions ▁intended ▁for ▁C roy ère ▁and ▁G mel in ▁about ▁the ▁carrying ▁out ▁of ▁series ▁of ▁physical ▁observations . ▁The ▁historian ▁Müller ▁draft ed ▁his ▁own ▁plan ▁of ▁work . ▁His ▁chief ▁goals ▁consisted ▁of ▁research ing ▁the ▁history ▁of ▁all ▁the ▁cities ▁the ▁expedition ▁would ▁visit ▁and ▁collect ing ▁information ▁about ▁the ▁languages ▁of ▁the ▁groups ▁they ▁would ▁meet ▁along ▁the ▁way . ▁The ▁pain ters ▁Johann ▁Christian ▁Ber ck han ▁( d ied ▁ 1 7 5 1 ) ▁and