Silting up of River and Malaria, &c.

The enormous network of rivers comprised in the delta of the Ganges and Brahmaputra frequently furnish examples of the shifting of the beds of streams and the diversion of considerable bodies of water into different channels, with consequent decrease in the flow of others. The general tendency, however, is inevitably to gradual silting up of the smaller rivers by the quantities of alluvium brought down in the rainy season, and this unceasing change cannot be without effect on the health of the districts comprised within this area. Yet but little definite knowledge oil the subject appears to be on