326 A. Tylor on the Amiens Gravel. 
Mr. Prestwich lays great stress, in his paper in the Society's 
Journal, p. 500, on the valley being too large to admit of the 
possibility of its being filled with water up to a height of 100 
feet above the present water-level. 
I have already submitted the argument that we ought to 
judge of the height of a flood by means of the debris it has 
left, and not by any theoretical notions of our own. 
I , twenty inches of rain fell in Scinde in twenty-four 
hours, in a flat country intersected by rivers. Nine gi 
weighing nearly eighty tons each, were washed off the piers by 
the Mulleer river from the Railway bridge, situated sixteen 
miles above Kurrachee (fig. 13). This bridge consisted of eight- 
een girders (see Plate IV, fig. 10). They were not box girders, 
but made of wrought iron on Warren’s system. The bottoms 
of these girders were sixty-five feet above high-water matk, 
spring tides, Kurrachee harbor, and seventy-four feet above low- 
water spring tides. They fell in the course of six hours; ‘ 
one girder of the weight of eighty tons was carried two ; 
down the river and nearly buried in sand.* The section of : 
the river bridge is represented (Plate IV, fig 10). The fall of 
the Mulleer river onlyaveraged ten feet per mile for fifteen miles 
above the bridge; and as rain rarely falls, there is generally less 
than a foot of water in the river-bed. This bed was nearly dry 
Fig. 13.—Map of the district near Kurrachee. 
I 
Sf 3 
& 
tel fi 
Sa wid aes 
Sy 
Jemedar LION P&C: 
ke Landi — 
the day after, as well as the day before this excena es In 
Other instances of the same kind have been reported “a. 
dia. The river first banked up wood and grass f these 
bridge and then threw the girders over. The weight © Ge 
girders moved in a river-bed of the dimensions Bist as the 
IV, fig. 11)} is an index of the rainfall in Scinde, JP" 
* Mr. John B i inde Railway. Weg me 
a he Meeting, and conimed this anton, whieh be had OMT 
vot Pigg: 10 and 11, Plate TV, are from drawings supplied by MEU" 
* 
