... This vaticination, which loses much in the translation, I have given rather fully, as it shows an observant mind... 
David Livingstone 「Missionary Travels and Researches in South Africa」
...It is worth the attention of the observant...
David Livingstone 「Missionary Travels and Researches in South Africa」
..." 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」
...As an initiatory lesson in making him observant of the flight and fallof birds, place a few pigeons, or other birds, during his absence, each ina hole covered with a tile...
Dinks, Mayhew, and Hutchinson 「The Dog」
...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」
... in any case; and ifMatey had been an observant creature...
A. J. Dawson 「Finn The Wolfhound」
...By eight o’clock he would be seen clinging toa branch and curiously observant of the dining-roomwindow, which at that hour probably excitedboth his interest and his alarm...
Fannie Hardy Eckstorm 「The Woodpeckers」
... quietly observant...
George Manville Fenn 「Dead Man's Land」
...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」
便利！手書き漢字入力検索