“Only in connection with these discoveries, we may, perhaps, well remind our readers of the many hints to be found in the ancient histories as to a certain secret in the possession of the Egyptian priesthood, who can instantly communicate, during the celebration of the Mysteries, from one temple to another, even though the former were at Thebes and the latter at the other end of the country; the legends attributing it, as a matter of course, to the “invisible tribes” of the air, which carry messages for mortals.
The author of Pre-Adamite Man quotes an instance, which being given merely on his own authority, and he seeming uncertain whether the story comes from Macrinus or some other writer, may be taken for what it is worth.
He found good evidence, he says, during his stay in Egypt, that “one of the Cleopatras (?) sent news by a wire to all the cities, from Heliopolis to Elephantine, on the upper Nile.””
H. P. Blavatsky
The Mark Of God: Understanding Your "I AM Presence" 