ley ▁ ▁Pe ake , ▁Arthur ▁S . ▁( 1 9 2 6 ) ▁ ▁The ▁Life ▁of ▁Sir ▁William ▁Hart ley . ▁ 1 st ▁ed . ▁H od der ▁& ▁St ought on . ▁ ▁Young , ▁David ▁M . ▁( 2 0 1 7 ) ▁Change ▁and ▁Dec ay : ▁Prim itive ▁Method ism ▁from ▁late ▁Victor ian ▁times ▁till ▁World ▁War ▁ 1 . ▁ ▁External ▁links ▁▁ ▁" Col ne ▁jam ▁phil anth rop ist ▁remembered ▁in ▁book " ▁Lanc ash ire ▁Te legraph ▁article ▁with ▁image ▁of ▁Hart ley . ▁▁ ▁website ▁which ▁gives ▁details ▁of ▁the ▁book ▁Change ▁and ▁Dec ay ▁which ▁contains ▁a ▁long ▁section ▁of ▁Sir ▁William ▁Hart ley ' s ▁influence ▁upon ▁the ▁changes ▁which ▁were ▁brought ▁over ▁Prim itive ▁Method ism ▁from ▁the ▁ 1 8 9 0 s ▁on wards . ▁ ▁Category : 1 8 4 6 ▁birth s ▁Category : 1 9 2 2 ▁death s ▁Category : Pe ople ▁from ▁Col ne ▁Category : Bus iness people ▁from ▁Mer se ys ide ▁Category : English ▁Method ists ▁Category : English ▁phil anth rop ists ▁Category : English ▁tax ▁res ister s ▁Category : K n ights ▁Bach elor <0x0A> </s> ▁The ▁collapse ▁of ▁comp ass ion ▁is ▁a ▁psych ological ▁theory ▁term ed ▁as ▁the ▁human ▁t endency ▁to ▁turn ▁away ▁from ▁mass ▁suffering . ▁This ▁theory ▁was ▁proposed ▁by ▁Paul ▁Slov ic ▁and ▁Deb or ah ▁Small . ▁This ▁theory ▁is ▁directly ▁linked ▁to ▁that ▁phenomen on