▁zo ological ▁dispers al , ▁migration , ▁and ▁other ▁natural ▁phen omena ▁are ▁dependent ▁ultimately ▁upon ▁temperature ▁plus ▁the ▁wind s . ▁While ▁his ▁dedu ctions ▁and ▁reasoning ▁are ▁not ▁without ▁considerable ▁value , ▁they ▁are ▁und ou bt edly ▁of ▁most ▁value ▁to ▁one ▁capable ▁of ▁real izing ▁the ▁weak ness ▁of ▁Commander ▁Ac worth ' s ▁orn ith ological ▁information ... ▁In ▁developing ▁his ▁own ▁special ▁theories ▁he ▁sets ▁up ▁one ▁st raw ▁man ▁after ▁another ▁and ▁succeed s ▁to ▁his ▁satisfaction ▁in ▁knock ing ▁it ▁down . ▁ ▁A ▁review ▁of ▁his ▁Bird ▁and ▁But ter fly ▁Myst eries ▁in ▁the ▁journal ▁Bird - B and ing ▁was ▁also ▁negative : ▁ ▁The ▁kind est ▁possible ▁app rais al ▁of ▁Captain ▁Ac worth ' s ▁theories ▁of ▁migration ▁is ▁that ▁they ▁might ▁be ▁true ▁if ▁birds ▁acted ▁in ▁the ▁way ▁he ▁thinks ▁they ▁do ▁and ▁if ▁they ▁fle w ▁in ▁an ▁atmosphere ▁in ▁which ▁there ▁was ▁no ▁tur bul ence ▁and ▁in ▁which ▁the ▁only ▁wind s ▁were ▁the ▁prev ail ing ▁wind s ▁of ▁the ▁clim atic ▁charts . ▁But ▁his ▁theories ▁do ▁not ▁hold ▁in ▁the ▁imper fect ▁real ▁world ▁in ▁which ▁orn ith olog ists ▁must ▁work . ▁ ▁Ac worth ▁received ▁criticism ▁from ▁natural ists ▁for ▁not ▁being ▁a ▁field ▁observer , ▁something ▁which ▁he ▁conf essed ▁to . ▁His ▁arm - ch air ▁spec ulations ▁such ▁as ▁his ▁un orth odox ▁ideas ▁about ▁c uck o os ▁were ▁dis pro ven ▁by ▁observ ational ▁research