Adam Smith, than whom few were better judges on this subject, once observed to me that 'Johnson knew more books than any man alive.
James, of whom he once observed, 'no man brings more mind to his profession.
He once observed to me, 'Whatever opinion Johnson maintains, I will not say that he convinces me; but he never fails to shew me, that he has good reasons for it.
I remember he once observedto me, 'It is wonderful, Sir, what is to be found in London.
I once observed a small spider walking in my path.
Mutilla europaea, a hymenopterous insect, makes a sibilant chirping, as I once observed at Southwold, where it abounds; but how produced I cannot say.
A third of the same tribe, (Trox sabulosus) emits a small sibilant or chirping noise, as I once observed when I found several feeding in a ram's horn.
I once observed a bunch of what I mistook for a singular mucor that adorned the vertex of a humble-bee, between the antennae, which doubtless were of the same description; and I even saw one upon its wing.
I once observed a fly fixed to a pane of glass, round which was a semicircle of what appeared to be merely vapour, whose radius was nearly three-fourths of an inch.
I once observed a pair of Pentatoma oleracea, a very pretty bug, in coitu, both sexes being ornamented with white spots, and by them stood a third distinguished from them by red ones.
The above list will hopefully provide you with a few useful examples demonstrating the appropriate usage of "once observed" in a variety of sentences. We hope that you will now be able to make sentences using this group of words.
