|The Classic FTB Wiki does not cover Thaumcraft 4, since it does not exist in Classic Feed The Beast (Minecraft versions 1.4.7 and earlier).|
You may find information about Thaumcraft 4 on our sister site, ftbwiki.org.
Thaumcraft 4 is a mod for Minecraft 1.6.4, the successor to Thaumcraft 3. Originally named "Thaumcraft 3.1", there are so many differences between the two that it was decided to be released as a full new version rather than just a major update. Thaumcraft 4 is beyond the scope of this Classic FTB Wiki; for more information, see ftbwiki.org.