& W. 8. Suilivant on Nobert’s Test-plate. 347 
mouths of the Terek and Kur are important fisheries, which 
compensate in some degree the inhabitants of these districts 
_ for the marshy and unproductive nature of the surface, 
ince the Russians have gained control of the Caucasus, the 
Government has taken great pains to foster all forms of pro- 
ductive industry, but its efforts have been much impeded, and 
often completely thwarted by the perpetual war which the 
mountaineers have maintained, In 1864, however, the last of 
the opposing forces were overcome and with the general resto- 
tation of peace it is hoped that the development of the re- 
sources of the country will advance with more rapid strides, 
important is the proposed rail road from the Black Sea to the 
. i 4 = hd . . d 
waspian, This will give a new impetus to the intellectual an 
industrial development of the country, hitherto so much re- 
tarded e want of unity and harmony among its hetero- 
Seheous population. : 
Note—A convenient map for consultation in connection with this article may 
befound in Haxthausen’s Transcaucasia, (2 vols. Svo. Leipsic, 1856.) A profile 
P Caucasus range, with the heights of numerous peaks, may be found in 
—" Mittheilungen for 1859, (tafel xii,) based Ag? the data o a 
nD, me of Abich’s papers on the geology of the Caucasus are give 
the Berlin Zeitscrift fiir Endeunde. ne of baie ie the volume for 1853, is illus- 
s + aa a profile, colored geologically, of the slope of the Caucasus, north from 
aged Eps. = 
ward Beschtau.— 
nr ane tOe 
Anr. XX XII.—Notes on Mr. Charles Stodder’s paper entitled 
Nobert’s Test-plate and modern Microscopes,” published in 
_ the American Naturalist, April, 1868; by W. S. Subtivast. 
a Mt. StoppEr’s paper above cited is full of interest to the 
Boke re In it is announced the resolution of lines on the 
a rt est-plate* which are as close together as the yrz:sa7 
sok English inch, and much exceed in fineness those hereto- 
Seen by other observers. 
reed Plate used in the trials fetailed by Mr. Stodder is one of nineteen bands, 
olen ruled to the 7,';, of a Paris line or to the ;74r5 of an Engiee 
oe increasing by 500 so that the 19th band is ruled to the press 
ae line or to they, 3533 of an English inch. 
