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Petri dish was developed by German physician Julius Richard Petri (after whom the name is given) while working as an assistant to Robert Koch at Berlin University. Petri did not invent the culture dish himself; rather, it was a modified version of Koch's invention. Koch had published a precursor dish in a booklet in 1881 titled "Zur Untersuchung von Pathogenen Organismen" ("Methods for the Study of Pathogenic Organisms"), which has been known as the "Bible of Bacteriology." He described a new bacterial culture method that used glass slide with agar and a container (basically a Petri dish, a circular glass dish of 20 × 5 cm with matching lid) he called "feuchte Kammer" (moist chamber). Bacterial culture was spread on the glass slide was then put in the moist chamber with a small wet paper. Bacterial growth was easily visible.