minimum was 43'0° F. on the 13th. This temperature, it will be noted, 
occurred on the night after the highest barometrical reading, 25'06 inches was 
taken. The lowest barometrical reading occurred on the 28th, between the 
two maximum temperatures for the month. This seems to bear out the rule 
regarding the inverse relationship between the thermometer and barometer. 
The average maximum and minimum readings were 811° F., and 579° F. 
respectively, whilst the average barometrical reading was 24°87 inches. 
The psychrometer showed differences between the two bulbs of ro‘o° or 
more, more frequently than not; but only once on the 25th, did the difference 
reach 15'0°. This was followed on the 26th by absolute saturation in the air, no 
difference between the bulbs being discernible. The rainfall on the 26th, as 
already stated, was °72 of an inch. 
July, 1909. Lan-chou Fu, Alt. 5106 ft. 
Observations were made at Lan-chou Fu from the rst to the 15th of this 
month, when the expedition left the district. 
During these fifteen days the average temperatures were slightly higher 
than those of June. The barometer remained correspondingly low, never 
once reaching 25°00 inches. The humidity of the air varied from saturation 
to a dryness showing a difference between the bulbs of 19°5°. 
Rain fell on six of the fifteen days, making a total fall of 1°29 inches, 
considerably more than that of the previous month. 
The direction from which the rain came was not properly recorded this 
month, but the last wind recorded before each period of rain was from the 
north-east. 
Wind was of less frequent occurence than during the preceding months, 
calm being recorded on seven days, whilst no reference whatever was made to 
the subject on three others. What wind there was came usually from the 
north-east. 
Cumulus and stratus clouds were prevalent till the 15th, when cirrus 
clouds were recorded. Nimbus clouds appeared on the 2nd. 
The maximum temperature for the fifteen days occurred on the 9th when 
87°8° F. was registered. The minimum was 53°0° F. on the 2nd. The 
highest barometer reading occurred on the 1st close to the date on which the 
minimum temperature was recorded, whilst the lowest barometrical readings 
occurred on the same date as the maximum temperature for the month. 
The highest and lowest barometrical readings were 24°98 inches, 24°70 
150 
