Above is the title page for the 1684 volume of *Acta Eruditorum.*

The first page of the October 1684 issue (number X) of *Acta Eruditorum* is shown above. Leibniz's first article describing the Calculus appeared on pages 467-473 of this issue.

A plate of diagrams for Leibniz's article on the Calculus was placed opposite page 467, the first page of the article. The reader is referred to it in the very first line of the article: note "TAB.XII," or Table XII, in the righthand margin of page 467, below.

Leibniz’s first article describing the Calculus was published in October, 1684. The article, *“Nova methodus pro maximis et minimis, itemque tangentibus,…, & singulare pro illis calculi genus*” [“New method for the maximum and minimum, and also tangents, …, and a singular type of calculus for them”], was a definitive exposition of his differential calculus. The adjective *"singulare*" is often translated as "remarkable": "a remarkable type of calculus for them." The initials "G.G.L." are for Gottfried Wilhelm Leibniz with Wilhelm latinized to *Guilielmus*.

Do you recognize the product and quotient rules for differentials in the second paragraph above? It helps to know that *"aequ.*" is used for "equals" or "=". The equals sign, =, is used in Leibniz's articles from 1686 and 1693 on the next two pages.

The remainder of the article is presented below in its entirety. A translation of the article from Latin to English can be found in D. J. Struik's *A Source Book in Mathematics (1200-1800),* pp. 271-280.

On the page above (page 469), Leibniz discussed differentials of powers (*potentiae*) and of radicals (*radices*). He also named the methods discussed in his article "differential calculus": see "calculi hujus, quem voco *differentialem,*" or "this calculus, which I call *differential"* at the start of the last paragraph.

*The images above are used through the courtesy of the Lilly Library, Indiana University, Bloomington, Indiana. You may use them in your classroom; for all other purposes, please seek permission from the Lilly Library.*

D. J. Struik (editor), *A Source Book in Mathematics (1200-1800),* Harvard University Press, Cambridge, Mass., 1969.