In 2000 back issues of this scholarly journal were made available to researchers through JSTOR (Journal Storage). JSTOR offers online access to numerous scholarly journals on a "moving wall" basis -- in which users may download the full text and figures of each article that is at least three-years-old. Currently, JSTOR coverage includes Philosophical Transactions: Biological Sciences, Vols. 329-352, 1990-1997. Newer articles are continually added on a moving wall basis. Access is limited to participating institutions.