New York, Aug. 20.

The weather last week, in this city, and suburbs, continued to be extremely hot until Sunday midnight, after a thunder squall. The change which then took place was very sudden and unhealthy.

Upwards of twenty persons fell unhappy [?]ic tions to the heat last week; and it is said, that as many of them died by over labouring as by drinking cold water, Raw rum has been found exceedingly pernicious in this extreme heat; --man who was seen intoxicated but a few momments before, suddenly fell on one of those days --and the cry was--" Poor fellow! he has certainly drank too much cold water!" Cold water has however been instantaneously fatal in se - veral instances. [ To be concluded in our next.]

