..." The reason for this, no doubt, is that people are not as a rule observant, and even if they notice a creature one moment they probably forget all about it the next... 
Edward Saunders 「Wild Bees, Wasps and Ants」
...It would tend to make him quick in thewater, and observant...
Dinks, Mayhew, and Hutchinson 「The Dog」
...You have an observant mind, a taste for research, a lively style and a ready pen...
J. Henri Fabre Alexander Teixeira de Mattos 「The Life of the Fly」
... quietly observant...
George Manville Fenn 「Dead Man's Land」
...Lutra being theonly female among the cubs, she naturallygrew to be the most keenly observant, andoften identified the finny visitor before herbrothers ventured to decide that it was nota moving twig...
Alfred W. Rees 「Creatures of the Night」
...This nativewas taciturn and observant of such natural circumstances, to a degree thatmade his opinion of value in doubtful cases...
Thomas Mitchell 「Journal of an Expedition into the Interior of Tropical Australia」
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