...He was very observant... 
W. E. B. Du Bois 「The Quest of the Silver Fleece」
...His observant criticismfor once failed him...
Various 「Ainslee's magazine, Volume 16, No. 2, September, 1905」
...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」
...An observant eye will notice, runninghorizontally around the middle, a fold which a needle is able to raisewithout breaking it...
J. H. Fabre 「The Wonders of Instinct」
... quietly observant...
George Manville Fenn 「Dead Man's Land」
...Nelson's eye, trained to be all observant, ranged far and wide, notingthe presence of many lacy, frothing geysers which spouted at varyingintervals...
Various 「Astounding Stories, February, 1931」
...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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