216 MR. GLAISHER ON THE RADIATION OF HEAT, AT NIGHT, FROM THE EARTH, ETC. 
Section II . — Simultaneous observations by Self-registering Minimum Thermometers 164 
Method of reducing the observations 164 and 1 65 
Arranged individual results from the observations forming Tables LI. to XCYIII 166 to 192 
Remarks upon Tables LI. to XCVIII 193 
Instances when the reading of the thermometer whose bulb was in the reflector differed by small ~| 
quantities only from that in air, at times when the sky has been cloudless but not bright / 
Times when the greatest differences have taken place 194 
Remark upon the probability of greater differences having taken place than those observed 195 
Table XCIX. — Mean monthly excess of the reading of the thermometer in air over those in the reflector 1 96 
Remarks upon the preceding Table 197 
Table C. — The mean yearly results 197 
Remarks upon the preceding Table 197 and 198 
Proportion of clear to cloudy nights within the 4 years’ observations 198 
The relative less reading of a thermometer placed on raw wool and that in the focus of the reflector, ] 
and deduction of the factor to reduce 'the observations of the former to those of the latter J 
Various sources from which heat is supplied to a thermometer placed upon the earth 198 
Factor to reduce the results derived from the use of a thermometer with its bulb in the focus of a 1 
t 198 
reflector to those which would have been given if the thermometer had been placed on grass ... / 
The reading of a thermometer placed on grass liable to a reading of 32° every month of the year ... 199 
Table Cl. — The monthly excess of the reading of the thermometer in air above those ~| 
, . „ > 200 and 203 
placed on different substances, &c J 
Table CII — The yearly excess of ditto 204 and 205 
Remarks upon the preceding Table 206 
Table CIII. — Results deduced from wholly cloudy nights, but the clouds not cirrostratus 206 
Table CIV. — Results deduced from wholly cloudy nights, the clouds being cirrostratus and from] 
3000 to 4000 feet in height J 
Table CV. — Results deduced from wholly cloudy nights, the clouds being cirrostratus, and - ! 
, , ^ _ _ . , . _ > /(Jo and J/uy 
less than 2000 feet in height J 
Table CVI. — Mean results deduced from all the observations 210 
Remarks upon the results in the preceding Table 211 
Deduction of the difference in height of the clouds, according to the amount of the depression of] 
the reading of a thermometer on grass below that in air J 
Table CVII. — Showing the mean temperature, mean state of cloudiness of the night, the greatest] ^ 
difference and the lowest readings in each month between 1841 February and 1844 December / 
Remarks upon the preceding Table 214 
Table CVIII. — Monthly mean of the lowest temperature of the air as observed every night, ] 
arranged according to the different states of the sky J ^ * 
