[ericbsmith]

Originally Posted by Joseph Paul

Is Magic necessary for an understanding of Thaumatology?

Originally Posted by Gnomasz

No, but around 80 pages are devoted to the spell system, which has a poor choice of spells outside of Magic, and syntactic magic advices to use the prices in Magic for magic items.

Basically Thaumatology isn't really a book about magic or a magic system, it is a book which presents several alternative magic systems several of which require the standard magic system and the spells from GURPS Magic to fully utilize. It also provides several systems which are completely independent from GURPS Magic. So the answer is a firm yes and no, but you will get more use out of Thaumatology if you have GURPS Magic.