258 DR. GUSTAV RADDE ON THE VERTICAL RANGE 
Rurrecur. “Flora Caucasica,” in * Mémoires de l'Académie 
impériale des Sciences de St. Pétersbourg,’ ser. VII, tom. 
xv. n. 2 (1869). 
This exceedingly valuable work offers for my purpose a host 
of special data, but the renowned author has been 
almost pedantically fastidious in his mention of alti- 
tudes. From a botanical point of view, I confine myself to 
what has been done by Trautvetter and Boissier. The 
systematic determination of most species of my collections 
was effected by Trautvetter, whose account in the ‘ Acta 
horti Petropolitani,’ ix. 1871-1887, may be consulted 
for details. 
Rappx. ‘Berichte über die biologisch-geographischen Unter- 
suchungen in den Kaukasuslündern. Tiflis, 1866. (Pub- 
lished by the author.) 
——. ‘Die Chews'uren und ihr Land.’ Cassel (Fischer), 
1878. 
—— ‘Reisen an die persisch-russischen Grenze. Leipzig 
(Brockhaus), 1886. 
——. ‘Die Fauna und Flora des südwestlichen Caspi- 
Gebietes.’ Do. 
——. ‘Aus den daghestanischen  Hochalpen. Gotha 
(Perthes), 1887. 
Before I pass on to the special botanical portion, I must mention 
where, and when, in the course of my journeys I have explored 
the high alpine and ice regions. 
1864. — I traversed the three main tablelands of Colchis, 
and then obtained the following heights, which concern the 
present communication (all altitudes being cited in English 
feet) :— 
Dadiasch, snow-line, 9402 ft. ; the summit itself, according to 
Abich, being 9618 ft. 
Görgi Pass, 9128 ft., in the stretch from Tomiari to the 9938 
ft. high Tschitcharo. 
Nöschka Pass, separating the sources of the two Hippos 
streams. : 
Naksagar Pass, towards Quirischi, in independent Suania, 
8831 ft. 
Karet Pass, on the way to the town Adisch in independe nt 
Suania, 9696 ft. 
