These numbers in Broad Street near the water pump had many of the deaths
20 ,21; 8,9
20 and 21 Broad Street and 8 and 9 Cambridge Street had no deaths….They didn’t drink the water from the Broad Street pump.
7
These families worked in the pub at 7 Cambridge Street. They didn’t drink the water from the pump.
不错哦 Careful reading
Read each paragraph and find out what evidence or approach is John
Snow used in the stage of experiment, then fill in the chart below.
Paragraph
Stages in an experiment
Example in this investigation
1
Find a problem
What causes cholera?
2
Make up a question
Which theory is correct?
3
Think of a method
Collect data on those who were ill or died and where they got their water.
4
Collect results
Plot information on a map to find out where people died or did not die.
5
Analyze results
Analyze the water to see if that is the cause of the illness.
6
Repeat if necessary
Find other evidence to confirm your conclusion.
7
Make a conclusion
The water is to blame. The source of all drinking water should be examined so that it is safe.
Step V. Discussion
1.What’s the significance of Snow’s famous cholera map ?
2.If you were John Snow, how would you investigate the cholera?
Step VI. Summary
Step VII. Homework assignment
1.Finish Ex.1 on P42.
2. Retell the story.
3. Prepare for tomorrow’s dictation.