SCIENTIFIC MISSION TO THIBET. 97 
“utricule primordiale:": to me it appears to be something deve- 
loped within it, but in what mode remains to be ascertained. 
W. Wirsos. 
Warrington, Sept. 28, 1847. 
References to the Plate. 
Tas. IV. B. Fig. 1, Pistillum of Zea Mays, of the natural size, 
before fecundation, taken from the upper part of a spike ; fig. 2, 
longitudinal section of the germen of ditto, magnified ten times ; 
fig. 3, the embryonary cavity, as seen in the same section, 
magnified forty times; fig. 4, the same, magnified about two 
hundred times, showing more fully and accurately the “ wéricule 
primordiale” of Mirbel and Spach, represented in their figures 11, 
13 and 15. 
BOTANICAL INFORMATION. 
Screntrric Mission to THIBET. 
(We have now the pleasure of giving extracts from the letter of 
Dr. Thomas Thomson, the receipt of which was announced in our 
. last number of the * London Journal,’ p. 28.—E».) 
** Camp, Pugha, ten miles from left bank 
of Indus, Sept. 22, 1847. 
“T cannot give you our dodi with greater accuracy; for the —— 
maps of the country we are now traversing are by no means correct. —— 
My last letter to you was written at Dankur, in Piti, and the PS. 
bore date the 4th of this month: I have therefore to render an — 
account of my wanderings since that time. We left the Piti valley —— 
on the 5th, and crossing the range of snowy mountains, which run 
parallel with it on the north, by the Parang Pass, we came upon e 
the river of that name near its source. Our observations made the - 
elevation of the Pass to be 18,600, or 18,700 feet. We followed 
the course of the Parang river, at first northerly, but then, for 
. three days, nearly due east, after which it turned south, and we - 
ae crossed it to proceed to Haulé. On our road thither, we crossed | 
E. the Sarak Pass, elevated. about 18, 000 feet, and arrived at Haulé 
