An extensive illustrated work, with 283 copperplate engravings, on the natural history of the Danube river, the longest river in central Europe, which runs from southern Germany into Austria, through Slovakia, Hungary, along Croatia, through Serbia and Romania, and along Bulgaria, towards the Black Sea, flowing through Regensburg, Vienna, Budapest, Belgrade and numerous other cities. 

Volumes 4-6 describe the animals living in the river and about its course, a description of the fish, birds and their nests, the quadrupeds roaming the banks, etc. The volumes are devoted to cartography, astronomy and hydrography (Volume 1),  archaeology and history of the settlements, towns, roads and bridges (Vol. 2); mineralogy (Vol. 3); fish (Vol. 4), which includes one plate with shells, and two with turtles; avifauna (Vol. 5); and several other subjects, including meteorological and climatological observations, notes on the river's velocity, the insects occurring in and near the river, etc., (Vol. 6). They are titled as follows: Tomus I, in tres partes digestus : geographicum, astronomicum, hydrographicum; Tomus II. De Antiquitatibus Romanorum ad ripas Danubii; Tomus. III. De Mineralibus circa Danubium effossis; Tomus IV. De Piscibus in aquis Danubii viventibus; Tomus V. De Avibus circa aquas Danubii vagantibus, et de ipsarum nidis.; Tomus VI. De Fontibus Danubii. Observationes anatomicae. De Aquis Danubii et Tibisci. Catalogus plantarum. Observationes habitae cum barometris et thermometris. De Insectis. Wood: “The part of ornithological plates with 74 drawings by the Italian artist Raimondo Manzini (1658-1730), including 59 birds, and 15 nests with eggs, the latter are considered the first illustrations of their kind in the history of ornithology” (DSB).