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1674 Philos. Trans. (Royal Soc.) 9 130 Earthy particles and filaments, which, without this precaution, might be taken for parts of the matter itself that is under observation.

1775 R. Cumberland Choleric Man ii. iii. 23 I dread the artificial graces which young women are too apt to put on, when they act under observation.

1835 W. Kirby On Power of God in Creation of Animals II. xix. 283 No animals fall more universally under observation than the Araneidans or spiders.

1859 ‘G. Eliot’ Adam Bede v. 37 She had wandered about..always recovering her air of proud self-dependence whenever she was under observation.

1871 Trans. Royal Soc. Edinb. 26 486 Of the mammals, the placentation of which most commonly comes under observation, the sow and the mare also offer well-known examples of the diffused form of placenta.

1910 Encycl. Brit. I. 55/1 One such star..was selected and kept under observation.

1933 E. W. Golding Electr. Measurem. xv. 526 In some forms of cathode-ray oscillograph special provision is made for photographing the wave-form under observation.

1995 Countryman Spring 74/1 Starlings feeding in a garden were under observation when it was noticed that one bird always stood at the edge of the lawn, squawking to be fed, just as fledglings do.

2000 G. F. Douglas-Sherwood Gloss. Lighthouse Service Terminol. (Assoc. Lighthouse Keepers) at False light The reflection off a nearby vertical surface, such as a cliff face or snow squall, resulting in a misleading identification of the light under observation.

1862 W. Leadbetter in Southern Hist. War (Confederate States Amer. War Dept.) (1864) 420 I prefered to retire to Chattanooga, disembarassing ourselves of sick, wounded, and baggage, and then returning to a favorable point on the road, hold the enemy under observation.

1883 N. Amer. Rev. July 45 He [sc. the prisoner] is, on reaching a point of probable safe release, at once restored to the rights, the privileges, and the obligations, too, of good citizenship, to be under observation until established in well-doing and re-adjusted to current affairs.

1913 in N.E.D. at Shadowed ppl. a. 9 Followed by a ‘shadow’ or spy, kept under observation.

1934 Discovery Nov. 319/2 The buildings under observation were the Great Temple, the Records Office and the Police Barracks.

1975 Economist 5 July 70/1 Two [tunnels]..are being blocked, and others are ‘under observation’.

1997 Wantage & Grove Herald 1 May (Beat Suppl.) 6/2 This is where the Neighbourhood Watch can and does come in to provide those missing components—and the miscreants can never know if and when they are under observation, a positive preventive measure in itself.

1876 Harper's Mag. June 77 Beaumont, securing the co-operation of the patient, and keeping him daily under observation from the year 1825 to 1832, studied with great patience and ability the character of this liquid when withdrawn from the stomach, and the successive changes taking place in the aliment during digestion.]

1879 S. O. Vanderpoel in A. H. Buck Treat. Hygiene & Public Health II. ii. 494 A rigid quarantine should be maintained over those in hospital as well as over those under observation.

1901 E. L. Munson Theory & Pract. Mil. Hygiene xvii. 752 Individuals who have been exposed should be segregated and kept under observation until the period of incubation of the disease concerned has passed.

1934 G. B. Shaw On the Rocks (new ed.) i, in Too True to be Good 201 Twelve guineas a week at her sanatorium in the Welsh mountains, where she wants to keep you under observation for six weeks.

1952 W. Plomer Museum Pieces xxi. 178 It was thought..that he had a tropical disease, and he was under observation.

1988 Washington Post 4 Dec. d1/6 Buddy Ryan spent Wednesday night under observation after a piece of pork lodged hazardously in his throat.