Displayed in this room are various instruments used in some of the scientific disciplines that began to develop in the second half of the 17th century. At this time meteorology was progressing rapidly, thanks to perfected instrumentation for measuring variations in thermometric, barometric and hygrometric values. The systematic use of increasingly improved microscopes led to striking achievements in the fields of biology and entomology. Francesco Redi, a pioneer in these fields of research, brilliantly combined refined strategies of experimentation with scrupulous microscopic observations. Telescopes of ever greater size and more complex optical systems were also being produced by expert instrument makers. With such progress in telescopic instrumentation, astronomical observations led to crucially important discoveries.