I think it is possible that I am guilty of posting first and asking questions later!

I believe my statement about preserves including the seeds is something I heard in my childhood, and have never seriously questioned. Now I'm not so sure. In my google search, I did find one reference where it is stated:

"Preserves are basically the same as jam unless you buy them from Smucker's, in which case if it's got seeds in it it's preserves and if it doesn't it's jam."

But most of the references I found spoke of preserves involving chunks of whole fruit, as opposed to fruit puree in the case of jam. But there was no mention of seeds. So perhaps I have it wrong.

Don