FLORA OF TIBET OR HIGH ASIA. 135 
warmest 35°. Average frost at night 12°. Temperature at 
7 p.m. on the 27th reached 64° Fahr. 
October: Bayan Gol, camp 127, to Tankar, camp 141; about 
97° 45' and 36°. From here the course was north-east and 
around the north coast of Koko Nor. Twenty-seven fine 
days ; two cloudy ; two with snow. Coldest night 5° Fahr. ; 
warmest 30° ; average night 22°. Cultivation is practised in 
long. 101°. 
Mr. Rockhill, whose route in 1892 was between 90° and 102° 
and 29° and 37°, compiled a table of mean monthly temperatures 
reproduced below. The Tibetan part of the journey was made 
during the months of February to September, and the general 
direction was southward. See “ Itineraries,” p. 148. 
Mean corrected Monthly Temperatures from January to 
October, 1892. . Fahrenheit. 
| | 
7 AM. 2 P.M. | 7PM. Mean. 
0 | 0° o | o 
January ......... 12 | 30°4 177 6-4 
February ......... 175 | 3890 27°0 27°8 
March ............ 189 | 39:0 | 263 | 281 
April wo... 281 | 524 | 325 | 371 
May .....eeeeeeee 409 615 | 443 | 489 
June cecececcecesees 357 | 562 | 383 | 434 
July cceceeseecceees 46 | B46 | 442 | 471 
August oc... 7 © 638 | 495 | 516 
September ......... 50°7 64:0 50°8 51-1 
October ............ 47°3 48:0 47-5 477 
| 
Some further information on climatology will be found in the 
extracts from the narratives of the various travellers whose 
itineraries are sketched below. These, we may add, are limited to 
the travellers whose botanical collections have been investigated 
by ourselves, or whose observations we have repeated. 
a 
I cannot conclude this introductory part without a few words 
respecting the authorship and the assistance received from 
various persons. Although Mr. Pearson is not responsible for 
LINN. JOURN.— BOTANY, VOL. XXXV. N 
