First‑hand narratives of balloon ascents undertaken while a capital was under siege are combined with technical discussion of aerostatic practice, atmospheric observations, and the design and handling of apparatus. The author critiques the persistent stagnation of ballooning and surveys recent experiments, arguing that the art must shift from spectacle to systematic scientific and practical development. Detailed accounts of varied excursions illustrate methods for studying weather and navigation in different conditions. The work mixes adventurous reportage with concrete recommendations for organized aeronautical training and improved equipment.