CLIMATOLOGY OF NEBRASKA. 23 



During the same period of 19 years, embraced in table "C," the 

 mercury has risen to ioo° and upwards as follows: 



1857. July 15, 102°, August 5, 100°, August 13, 101°. 



1859. July 14, 101°. 



1860. July 15, 100°, July 20, 104°, July 24, 100°. 



1861 . August 3, 100°, August 4, 104°, August 5, 104°. 

 1866. July 23, 100°, August 6, 101°. 



1868. July 18, 100°, 20, 106°, 21, 100°, 28, 101°. 



1873. August 30, 101°. 



1874. July 7, 102°, 8, 105°, 14, 103°, 18, 100°, 23, 104°, 24, 107°, 25, 113°, 

 31, 110°, August 9, 100°, 10, 111°, 19, 100°, 21, 102°. 



Dr. Childs' remarks of the above last two months "that the heat 

 was unparalleled on any record made in the United States." 

 During this period of nineteen years eleven have passed without 

 raising the mercury to 100 degrees. 



The force or velocity of the wind is now generally rated on a 

 scale of 10, as follows: 



1. Indicates a very light breeze of 2 miles an hour. 



2. Indicates a very gentle breeze of 4 miles an hour. 



3. Indicates a very fresh breeze of 12 miles an hour. 



4. Indicates a very strong wind of 25 miles an hour. 



5. Indicates a very high wind of 35 miles an hour. 



6. Indicates a gale of 45 miles an hour. 



7. Indicates a very strong gale of 60 miles an hour. 



8. Indicates a very violent gale of 75 miles an hour. 



9. Iiadicates a hurricane of 90 miles an hour. 



10. Indicates a most violent hurricane of 100 miles an hour. 



This velocity is measured and registered by rather a costly in- 

 strument named an anemometer. 



Without an anemometer, the observer notes the direction from 

 which the wind comes, and estimates its force as 1, 2, 3, and 6. 

 This observation and record is made three times a day — the same as 

 with other meteorological instruments. In table "D," I give a sum- 

 mary of these observations for the year 1874. 



