In response to Omer Casher's request for information about electronic chemistry thesauri on the web, I would like to encourage him and other interested parties to examine the Chemical Abstracts General Subject Index Vocabulary Search Aid on the CAS web site (http://www.cas.org). The search aid can be accessed by clicking on "New and Revised CA Indexing Terms in 1997" on the CAS homepage, and then clicking on the "search aid". The search aid provides alphabetical, hierarchical, and word search access to the terms used in the Chemical Abstracts (CA) general subject index vocabulary. Terms are hyperlinked to broader, narrower, and related terms in the CA index vocabulary; some synonymous terms are also given. Under the hierarchical arrangement, users will find CA index terms arranged in hierarchical relationships to the full set of terms in the vocabulary, similar to that of a thesaurus. While the vocabulary is not yet presented in the form of a full thesaurus, the CA search aid provides access to a wide range of chemical terms arranged in a useful hierarchical fashion. It should be recognized that the terms are those used in CA indexing and therefore they represent only those ideas that are frequently indexed (i.e., not all chemical terms are included). Also, specific chemical substance names are not included. David W. Weisgerber Editor, Chemical Abstracts Service ----- chemweb: A list for Chemical Applications of the Internet. Archived as: http://www.ch.ic.ac.uk/hypermail/chemweb/ To unsubscribe, send to listserver@ic.ac.uk the following message; unsubscribe chemweb List coordinator, Henry Rzepa (rzepa@ic.ac.uk)