Meanings of only observation in English

This was the only observation he had made for many years.

The only observation of Bultje, on learning that some of them had been shot, was Stupid whitefellows!

Sybil, though uninstructed in painting, had that native taste which requires only observation to arrive at true results.

On his presenting himself, his father's only observation and speech of welcome to him was, Hallo, Linky, my dear boy!

But occasional use has been made of them for purposes of checking, and for supplying the only observation missing in the ten months.

Commission in Edinburgh?-I have; and the only observation I would make upon it is, that I am not a believer in it generally.

My only observations being a Vespa puncturing Cassandra calyculata, an Andrena (?)

"Let them wait my good pleasure," was the only observation he made on the subject.

Since most associations were U- or J-shaped, only observations below the sample mean were included to calculate hazard ratios (HRs) per one SD lower value.