Magnesium ammonium phosphate, MgNH 4 PO 4.6H 2 O, is found as the mineral struvite and in some guanos; it occurs also in urinary calculi and is formed in the putrefaction of urine.
Probably a mere variety of the black poplar, its native land appears to have been Persia or some neighbouring country; it was unknown in Italy in the days of Pliny, while from remote times it has been an inhabitant of Kashmir, the Punjab, and Persia, where it is often planted along roadsides for the purpose of shade; it was probably brought from these countries to southern Europe, and derives its popular name from its abundance along the banks of the Po and other rivers of Lombardy, where it is said now to spring up naturally from seed, like the indigenous black poplar.
The osmotic pressure Po is the difference of the hydrostatic pressures P' and P of the solution and the solvent when their vapour pressures are equal.
Annually, the Po delle Tolle 262 ft., the Po della Gnocca I I 11 ft., and the Po di Coro 259 ft.
Commerce is chiefly agricultural and is stimulated by a good position in the railway system, and by a canal which opens a water-way by the Panaro and the Po to the Adriatic. Modena is the point at which the railway to Mantua and Verona diverges from that between Milan and Bologna, and has several steam tramways to neighbouring places.
Friendly relations are maintained with Spain, as the Spanish plantations in Fernando Po are to a great extent worked by Liberian labour.
The relief of debtors, and the steps which he took to restore Italian agriculture, were of the nature of palliatives) those which have a permanent significance as indicating his grasp of imperial problems. The Social War had brought to the inhabitants of Italy as far as the Po the privileges of Roman citizenship; it remained to extend this gift to the Transpadane Italians, to establish a uniform system of local administration and to devise representative institutions by which at least some voice in the government of Rome might be permitted to her new citizens.
This, with the exception of a brief tenure of Cremona (1499-1512), formed her permanent territory down to the fall of the republic. Her frontiers now ran from the seacoast near Monfalcone, following the line of the Carnic and Julian and Raetian Alps to the Adda, down the course of that river till it joins the Po, and thence along the line of the Po back to the sea.
Post-positions, pa or be and ma, are required by the noun (substantive or adjective) that is to be singled out; po or bo (masc.) and mo (fern.) are used for distinction of gender or for emphasis.
In 387 Magnus Maximus, who had commanded a Roman army in Britain, and had in 383 (the year of Gratian's death) made himself master of the northern provinces, crossed the Alps into the valley of the Po and threatened Milan.