We offer here a variety of 19th-, 20th-, and 21st-century lectures on aspects of the medium of photography, by a spectrum of authors. We've arranged them in loose thematic clusters, according to the author's last name. These are the texts of keynote talks, speeches, and other publicly delivered presentations of their ideas by the speakers represented. In most cases, they have been published; in some instances, they have not. Their publication status and source are indicated at the end of the text.

• A. D. Coleman
• Peter Henry Emerson
• Lew Thomas

We apologize for any errors, and appreciate corrections of any inaccuracies in what we've posted here, especially if they come accompanied by exact sources (publication, author, volume, issue, page numbers, etc.) for your information. Just email us at corrections@photocriticism.com.

We welcome your suggestions for additions to this category of material in our Photography Criticism CyberArchive. In doing so, you'll expedite our pursuit of that material by citing as completely as possible the bibliographic reference from which you've derived your interest in it, and (if possible) contact information for the author. You can send recommendations to us at suggestionbox@photocriticism.com.