Volume 4 is now available online. In this and the  subsequent volumes of Aestimatio, all items will be published when they are ready rather than when the issue is complete. This move to continuous publication means that Aestimatio will no longer appear annually in two issues: from here on there will only be annual volumes.

Volume 4  is freely accessible at https://jps.library.utoronto.ca/index.php/aestimatio/issue/view/2809.