The system of sevens: looking for help in understanding this concept

[tadeus]

It is rather ridiculous that gutenberg.org is blocked in Germany. I hope Gutenberg's descendants are benefiting from the sales of his printing press. The quoted book is also available on archive.org:

https://archive.org/stream/thesquareofse.../19687.txt

Thanks - then archive.org has of course to be indicted too.  

Of course i could have use an workaround with an foreign proxy server.
So the main question is what will be the main information Moonfox references in this book?

The content seems to talk about a system of laying cards.