462 



4 p.m., the range being 4 6. In the corresponding inequality of ordinary temperature in Table I. the 

 minimum and maximum appear at 2 a.m. and 2 p.m. respectively, the range being 3 '4. 



At equinox, the most prominent feature in Table XL, as in Table I., is the maximum in the early 

 afternoon. The lowest value for the day occurs at 6 to 8 a.m. in Table XI. as compared to 6 a.m. in 

 Table I.; in both tables the values from 8 p.m. to 8 a.m. are below the mean. The range is 2 - 8 in 

 Table XI. as against l-4 in Table I. 



For midwinter, Tables XI. and I. both show lowest temperatures at or near midnight, and both show 

 two fairly distinct maxima, one in the forenoon, the other in the afternoon. The difference between 

 the extreme values is 2 -4 in Table XL as against l'l in Table I. 



Thus, on the whole, exceptionally low minima follow much the same law as ordinary minima. Both 

 show a diurnal inequality resembling that for ordinary temperature, but possessing in most months a 

 decidedly larger range. On the average the diurnal range is larger for the extreme than for the ordinary 

 minima. 



