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Updated: June 6, 2025
Great rivers carry no boulders to the sea, and, in fact, receive none from their tributaries. Lombardini found, twenty years ago, that the mineral matter brought down to the Po by its tributaries was, in general, comminuted to about the same degree of fineness as the sands of its bed at their points of discharge.
Those tributaries lodge much sediment in the Lake of Geneva and the Lac de Bourget, but the total erosion of the Po and its affluents must be considerably greater than that of the Rhone system. The Rhine conveys to the sea much less sediment than either of the other two rivers. Lombardini, Cargiamenti nella condizione del Po, pp. 29, 39.
See Baird Smith, Italian Irrigation, i., p. 25; Scott Moncrieff, Irrigation in Southern Europe, pp. 34, 87, 89; Lombardini, Sulle Inondazioni etc., p. 73; Mangon, Les Irrigations, p. 48. The practice of irrigation except in mountainous countries where springs and rivulets are numerous is attended with very serious economical, social, and political evils.
The eminent Italian engineer Lombardini published in 1870, under the title of Guida allo studio dell' idrologia fluviale e dell' Idraulica practica, which serves both as a summary of the recent progress of that science and as an index to the literature of the subject. But in any event, these theoretical objections are counsels apres coup.
Even in the artificial production of monsters much has been done, and a glance at the work of Dareste well repays the trouble. Essays on teratogenesis, with reference to batrachians, have been offered by Lombardini; and by Lereboullet and Knoch with reference to fishes.
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