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* The frost of 1788— -89 has been included, as it occurred but little more 
than 100 years ago. The temperatures, however, are not from self-register- 
ing thermometers, but the observations used as the maximum were made at 
two p.m., and those for the minimum at eight a.m. each day. The obser- 
vations for all other periods are from self-registering thermometers. The 
above table is compiled from observations made in London and its vicinity, 
with the addition for 1890—91 of the Blofield temperatures for comparison. 
