116 L. CASELLA'S CATALOGUE 



1263. Gillett's Achromatic Condenser, with diaphragm and spots . 4 15 



1264. WEBSTEE'S ACHEOMATIC CONDENSES, with diaphragm for dark ground and 



oblique illumination . . . . . . 280 



1265. WEBSTEE'S ACHEOMATIC CONDENSES, with graduating diaphragm 3 12 



1266. BACK AND PINION ADJUSTMENT to above, if required . . 12 6 



1267. GEADUATING DIAPHEAGM TO MICEOSCOPE . . . 150 



1268. Kinsley's Condenser, with diaphragm . . . 330 



1269. WENHAM'S WHITE CLOUD ILLUMINATOE, for binoculars 14 6 to" 2 



1270. EEADE'S HEMISPHEEICAL CONDENSES, with adjusting diaphragm and shutter 



1 15 



1273. SPOT LENS 6 to 7 6 



1274. PAEABOLOID, for dark ground illumination, with high powers 



12 to 1 10 



1275. Amicis Prism, mounted on stand . . 1 2 to 2 12 6 



1276. mounted to sub-stage . . '-. 1150to280 



1277. IMPEOVED ACHEOMATIC PEISM, with all adjustments, fitted to tail-piece of 



microscope . -. . . . . 2 5 to 3 5 



1278. EECTANGULAE PEISM, mounted as above . 1 2 to 280 



1279. NACHET'S PEISM for oblique light, mounted to sub-stage * 150 



1280. EEADE'S DIATOM PEISM * .. .. . 14 6 to 1 15 



1282. LISTEE'S DAEK WELLS (set of three) and holder * 12 6 



1283. EAINEY'S LIGHT MODIFIES . . .050 to 076 

 1284 MALTWOOD'S FINDEE . . . ,,.'... * ' * 070 



1285. Frog Plates . . . . . . 5 6 to 12 6 



1286. SETS OF DIPPING TUBES, in case . .. . 1 6 to 6 



1287. GLASS TEOUGHS . . Y . . 5 to 9 



1288. MOEEIS'S UNIVEESAL STAGE PLATE . . .056 and 086 



1289. Goniometer, for measuring the angles of crystals . . 3 15 

 1890. PAIE OF DOUBLE IMAGE PSISMS, and selenite film, with fittings to eye-piece, 



and brass plate with holes ..... 2 10 



1292. POLAEIZING APPAEATUS TO MICEOSCOPE . 1 4 to 3 15 



1293. Selenite Films, various , . . .016 to 090 



1294. in brass slides , . . 3 to 12 6 



1295. CEYSTALS, cut to show the optic axis . , ' f " 060 



1296. TOUEMALINES, mounted . . . . 6 to 12 

 1897. NACHET'S CONCENTEIC STAGE . . * "^ from 140 

 1298. MiCEO-SpECTEOSCOPE, adapted to any microscope, will show two spectra in the 



field of view at the same time . . * * 660 



