In his thesis Malassez provided the initial description of the hemocytometer, which he invented, but which was named by Gowers, who modified it in 1877. The trade issue of the thesis was published in Paris by Adrien Delahaye. See also Malassez's "Nouvelle méthode de numération des globules rouges et des globules blancs du sang", Arch. Physiol. norm. path., 2 sér., 1, (1874) 32-52. Digital facsimile of the 1873 trade edition from BnF Gallica at this link.