As time went on, the publication of volumes faced increasing delays, beginning with the 13th and 14th volumes, which coincided with the end of the First World War. The final volume, XX, is divided into two parts, as was customary in the previous century with the História e Memórias [History and Memoirs] of the ACL. Even the title underwent changes, as noted in Vol. XX, Part 2, p. 22: "Note: This Bulletin was titled Boletim da Segunda Classe until Volume XII. In Volume XIII, it was renamed Boletim da Classe de Letras [Bulletin of the Arts and Humanities Class] until Volume XV, reverting to Boletim da Segunda Classe in Volume XVI."

We can identify some of the most notable figures in the class between January 1898 and December 1909. The second session of 1898, held on 28 January, was attended by full members Gama Barros, Teixeira de Aragão, and Teófilo Braga, along with corresponding members Brito Aranha, Consiglieri Pedroso, Gonçalves Vianna, Leite de Vasconcelos, and Vasconcelos Abreu (Vol. I, 1898, p. 28). Noteworthy elections during this period include Christovam Ayres, who was elected a corresponding member in 1899, and Hintze Ribeiro and Veiga Beirão, who became full members in 1900. Machado de Assis was elected in 1904, followed by Júlio Dantas and Carlos Malheiro Dias as corresponding members in 1908 and Edgar Prestage as a foreign correspondent in 1909. In December 1909, opinions were issued regarding the admission of Silva Gaio and Oliveira Lima. In January and February 1907, Hintze Ribeiro (1849–1907), a former President of the Council of Ministers, and Júlio de Vilhena, then Secretary of State, presided over the sessions (Vol. II, 1910, pp. 195 and 201). This highlights how porous the ACL has remained since its foundation in relation to established political powers and intellectuals with a public role.

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