EVOLUTION OP SULPHURETTED HYDROGEN. 259 
tion of the country equally healthy with Viareggio. To 
complete the arrangement, it was now only required to guard 
the ditches of Montrone and Tonfalo with sluices; the former 
was finished in 1819, and the latter in 1821. Since that time 
the diseases of malaria have ceased so entirely at all points, 
that no other dangers are now incurred regarding the insalu- 
brity of the atmosphere than such as may arise from neglect 
of these sluices, which the inhabitants of the country should 
regard as their palladium. — Friend of Jifrica. — No. 3. 
Edinburgh Philos. Journ. 
