He had intended to extend his cover of history to the end of the 18th century and part of the third volume on this topic was printed by the time he died, four months after the publication of the new editions of 1799. Lalande, with the help of some other scientists, completed volumes three and four to give the coverage that Montucla had intended.
Siya ay inilaan para i-extend ang kanyang takip ng kasaysayan sa dulo ng ika-18 siglo at ang ikatlong bahagi ng lakas ng tunog sa paksang ito ay na-print na ng oras siya namatay, apat na buwan matapos ang paglalathala ng mga bagong edisyon ng 1799. Lalande, sa tulong ng ilang mga iba pang mga siyentipiko, natapos na tatlong volume na at apat na upang bigyan ang coverage na Montucla had intended.