In addition to being printed promptly after each working session as stand-alone booklets, the Comptes Rendus were printed and bound in semi-annual volumes, almost all of which are now digitised and available online.
NB : In 1856 and 1861 were also published some addenda, the Suppléments aux Comptes rendus des séances de l'Académie des sciences [all disciplines altogether] :
Back issues of the Comptes rendus have tables by subject and by author to facilitate the search for specific articles.
Table générale des Comptes rendus des séances de l'Académie des sciences for the period 1835-1940 (one multidisciplinary journal):
For the period 1940-1965 (one single multidisciplinary journal), each half-yearly volume ends with tables. To find them in a digital library (such as Gallica or the BHL), please refer to last part of the volume. E.g. for t. 257 for the year 1963, the tables are at the end of vol. 3 (nov.-dec.).
The same "last part of the volume" principle applies to the tables for the 1966-1996 period, although this time there are separate series, one for each discipline.
The Académie's Publications Service is at your disposal if you need help in finding a particular article or conducting research on a specific topic.