The first half of TiHKAL is an excellent commentary on the Shulgin's personal experiences with tryptamines. It also contains a complete cross-index into the chemicals of the second half. Purchasing a copy is highly recommended.
For your offline perusal...
(https://www.thevespiary.org/rhodium/Rhodium/hive/hiveboard/picproxie_imgs/pdf.gif)
Edit:Oops..meant to post in Tryptamines.
http://www.erowid.org/library/books_online/tihkal/tihkal.shtml (http://www.erowid.org/library/books_online/tihkal/tihkal.shtml)
Someone just downloaded that site and converted it to PDF format.