CAUTION: The Sender of this email is not from within Dalhousie. Let us recall that our friend and colleague Christian Lair, a well-known specialist on Sketch Theory, passed away on September 25, 2020.We would like, ina next issue of the "Cahiers", to publish a short notice on his career and his work with, above all an, as complete as possible bibliography of his works. So, not to forget anything, we would appreciate that those who have collaborated with him, or those who have worked under his direction, send us references of the work in question. Sincerely Andree Ehresmann and Rene Guitart [For admin and other information see: http://www.mta.ca/~cat-dist/ ]