What the dervishes are able to do during the ecstacy caused by Zikr, I had once an opportunity of witnessing in Samarkand.
There are many different orders, and several other kinds of zikr besides the two most commonly seen by travellers.
This form of prefacing the zikr is commonly used, by almost all orders of darweeshes in Egypt.
The zikr here described was performed near the tomb of a saint, for whose sake it was celebrated.
The Zikr are only various forms of devotion invented by the Sufi guides to develop the spiritual life.