"It was hardly perceptible.

Just a slight loss of firmness and distinctness; such a trifling change as you would expect to find in the handwriting of a man who had taken to drink or drugs, or anything that might impair the steadiness of his hand.

I should not have noticed it, myself, but, of course, the people at the bank are experts, constantly scrutinizing signatures and scrutinizing them with a very critical eye." "Is there any other evidence that bears on the case ?" Thorndyke asked.
Marchmont turned over the bundle of papers and smiled grimly.
"My dear Thorndyke," he said, "none of this evidence has the slightest bearing on the case.

It is all perfectly irrelevant as far as the will is concerned.

But I know your little peculiarities and I am indulging you, as you see, to the top of your bent.