...That made me observant and led meto notice a second point... 
John Buchan 「Mr. Standfast」
...It would tend to make him quick in thewater, and observant...
Dinks, Mayhew, and Hutchinson 「The Dog」
...In the well-known American Morgan, theswiftest and strongest of our harnessed forms, the observant eyedetects indications of this masterful blood...
Nathaniel Southgate Shaler 「Domesticated Animals」
...The observant naturalist of the field has the sense—at least he has itif he be endowed with a little imagination—of the immense pleasurewhich life gives to most wild animals...
Nathaniel Southgate Shaler 「Domesticated Animals」
...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」
...These episodes are but examples of parallels which will occur to the observant reader...
Chretien DeTroyes 「Four Arthurian Romances」
...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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