▁instructions ▁from ▁Vic ero y ▁Cru illas . ▁ ▁In spe ction ▁tour ▁In ▁the ▁latter ▁half ▁of ▁the ▁eigh teenth ▁century , ▁front ier ▁conditions ▁in ▁northern ▁New ▁Spain ▁had ▁d eter ior ated ▁to ▁such ▁an ▁extent , ▁partly ▁as ▁a ▁result ▁of ▁Indian ▁dep red ations ▁and ▁management ▁of ▁pres id ios , ▁that ▁the ▁Spanish ▁crown ▁found ▁it ▁necessary ▁to ▁order ▁an ▁exam ination ▁of ▁the ▁entire ▁front ier ▁with ▁the ▁view ▁of ▁re loc ating ▁pres id ios ▁and ▁making ▁whatever ▁other ▁adjust ments ▁might ▁be ▁necessary ▁to ▁prevent ▁further ▁abandon ment ▁of ▁the ▁front ier ▁settlement s . ▁The ▁Mar ques ▁de ▁Rub í ▁was ▁given ▁the ▁assignment ▁of ▁investig ating ▁this ▁problem . ▁He ▁began ▁his ▁investigation ▁in ▁ 1 7 6 6 . ▁Royal ▁engine ers ▁Nicolas ▁de ▁La ▁For a ▁and ▁Joseph ▁de ▁Ur rut ia ▁assist ed ▁Rub i ▁by ▁drawing ▁plans ▁of ▁pres id ios ▁and ▁draft ing ▁maps ▁of ▁the ▁area ▁travers ed . ▁ ▁On ▁March ▁ 1 2 , ▁Rub í ▁set ▁out ▁on ▁his ▁ins pection , ▁travel ing ▁first ▁to ▁Qu er ét aro ▁and ▁then ▁to ▁Z ac ate cas . ▁On ▁April ▁ 1 4 ▁he ▁was ▁joined ▁at ▁Dur ango ▁by ▁Nicol ás ▁de ▁La for a , ▁his ▁engineer ▁and ▁map maker , ▁who ▁kept ▁a ▁di ary ▁of ▁the ▁tour , ▁as ▁did ▁Rub í ▁himself . ▁Rub í ▁began ▁his ▁ins pection ▁tour ▁in ▁New ▁Mexico , ▁moved ▁to ▁Son ora