Brown Bag Lecture: “Representations of Chemical Entities in the Late 19th Century” (cancelled)

Brown Bag Lecture icon
Date: October 30, 2012
Time: 12 p.m. to 1 p.m.

315 Chestnut Street
Philadelphia, PA 19106

Event Type: Open to the Public
Fee: Free
RSVP Online: No Registration Required

A talk by Ari Gross

Note: due to inclement weather, this event has been cancelled.

How do you represent that which cannot be seen? How do general stylistic conventions, limitations of one’s media, and technical considerations come into play when depicting objects that escape the eye? Specifically, how did late 19th-century chemists depict the objects of their inquiry, and how did their depictions in turn affect their work? This talk will introduce Ari Gross’s research into the history and philosophy of late 19th-century structural chemical diagrams and models. Gross will review his earlier work on the representations used by Kekule and Crum Brown in the 1860s and introduce his latest research on the diagrams and models employed by early stereochemists from the 1870s onward.

Ari Gross is a Ph.D. candidate at the Institute for the History and Philosophy of Science and Technology at the University of Toronto. He holds a B.Sc. in physics (Mt. Allison University) and an M.Sc. in history and philosophy of science (Utrecht University). His primary research is on the history and philosophy of diagrams of “invisible” objects, although he also holds a strong interest in anatomical representations. He is also co-curator of the University of Toronto Scientific Instrument Collection ( and coeditor of the journal Spontaneous Generations: A Journal for the History and Philosophy of Science.

About Brown Bag Lectures

Brown Bag Lectures (BBLs) are a series of weekly informal talks on the history of chemistry or related subjects, including the history and social studies of science, technology, and medicine. Based on original research (sometimes still in progress), these talks are given by local scholars for an audience of CHF staff and fellows and interested members of the public.

For more information, please call 215.873.8289 or e-mail

Register for an event link

Need Meeting Space?

CHF’s state-of-the-art conference center is in Philadelphia’s beautiful historic district.

Brown Bag Lecture Series

Enjoy a bring-your-own brown-bag lunch while listening to CHF scholars share their research.

Fellowships at CHF

CHF’s scholars, who spend anywhere from one to nine months in residence, form a vital part of CHF’s intellectual life.

Support CHF

Help us preserve and share the history of chemistry and related sciences. Make a tax-deductible tax-deductible gift online.