Just Got In
This compilation of excerpts includes all the public comments Osho makes about Osho Dynamic Meditation and is presented in the order in which they were spoken, so you can appreciate the gradual development of this technique over time.
The fourth stage was first presented in its current form in "The New Alchemy: To turn you on" Appendix 1, titled "Catharsis and Meditation: Steps on the Path."
You will notice that in the first references the instructions for the fourth stage are "to just fall down as if dead relaxed and to become a witness". Later, the technique was refined to its current form of five stages with a stop at the end on the first three stages.
Bold text for some keywords are added to help the reader find the more specific references on the technique.