He was on his way to the front of the house to make further observations.

Then he shook his head and without further observation left the control room.

"They were going to take her to a nearby hospital for further observation."

A person may be admitted to the hospital for further observation.

And since you do, I shall offer some further observations.

He hoped that further observations would clear the matter up in the following months.

Now and then Barnes cut in with a further observation.

That was enough in his book to justify further observation.

But he is keeping them in reserve for further observation.

He left the hospital that night after getting treatment, even though the doctor wanted him to stay overnight for further observation.