There is, however, what may be described as a perpen- dicular division also, and this is somewhat more difficult to comprehend, especially as great reserve is always maintained by occultists as to some of the facts which would be involved in a fuller explanation of it. Pefhaps the clearest way to put what is known pn the subject will be to state that in each of the horizontal classes and subclasses will be found seven* perfectly distinct types of elemental, the difference between them being no longer a question of.degree of materiality, but rather of character and affinities. * * Each of these types so reacts ugon the others that, though it is impossible for them ever to interchange their essence, in each of then} seven sub-types will be found to exist, distinguished