If the November folder is missing then you or someone else has removed that folder.

See also http://kb.mozillazine.org/Viewing_the_browsing_history_-_Firefox

Ok. Thank you, i did wonder whether that was the case but I have no idea how I removed it. No one else uses this computer so I'll have to watch carefully what i do. From now on I can expect to see all history unless i inadvertently remove it?

Hopefully.
If not then see http://kb.mozillazine.org/Bookmarks_history_and_toolbar_buttons_not_working_-_Firefox

Cheers. Better save the email so I can find the link again. I'll think about it more after I return later from work.

Hello-- just thought I'd let you know how things have been incase you can comment. When I returned from work yesterday a-noon and checked History -October had gone and November was there (I have only had the computer since Oct). Had a look this morning and once again Nov has gone and Oct is back. So it is suiting itself. If i mistakenly tried to delete something would it not double check before delete was final? Or is it as simple as highlighting the item and clicking delete? Thanks for any help. I might have to use your link.