OCTOBEB 5, 1906.] 



SCIENCE. 



425 



the pieces discolored by oxide of iron 

 picked out as waste, American feldspar 

 calcined in the glass oven, calcined feldspar 

 ground and ready for use in Parian, soft 

 Cornish stone (slightly decomposed, most 

 decomposed, etc.), hard and soft Cornish 

 stone fired in the biscuit oven, hard and soft 

 Cornish stone ground and mixed, as used 

 for the body and glaze of ware, pigments, 

 glazes, slips, frits, chemicals (about ninety 

 glass bottles enclose these ingredients), and 

 the various stages of the ware with imple- 

 ments, in a superb and very precious ex- 

 hibit of vessels, vases and plaques, partly 

 chronological. 



The archeological and ethnological ex- 

 hibits are of great merit and value. A 

 small group of objects labeled 'chemical 

 balance and other apparatus used by Pro- 

 fessor Joseph Black' will attract the rever- 

 ent attention of chemists. 



The general mineralogical collection is 

 an excellent and adequate representation 

 of the mineral retinue of species from the 

 native elements to the hydrocarbons, 

 though it is quite lacking in distinction or 

 phenomenal beauty. It is well arranged, 

 for purposes of study, in fiat cases around 

 the central opening under the skylight, and 

 in fiat cases about the walls, with larger 

 specimens above and below the latter. 

 There is noticeable in it good spodumene 

 from Norwich, Conn., and hiddenite from 

 North Carolina, a remarkable pink topaz 

 from the Ural Mountains, three crystals of 

 euclase, some striking scolecite from Ice- 

 land, excellent torbernite, superior barite 

 crystals, a handsome halite group, an at- 

 tractive exhibit of hydrocarbons, and a 

 small complementary collection of pseudo- 

 morphs — of much interest — amongst which 

 the pseudomorph of vesuvianite after gar- 

 net deserves mention, A beautiful crystal- 

 lized gold specimen from Ballarat, weigh- 

 ing six and three fourth ounces, a large 

 platinum nugget, good atacamite, crystals. 



corundum, bournonite, green fluors, apoph- 

 yllite from India, and the handsome ruled 

 agates from the Faroe Islands are also 

 memorable. 



In lithology the constituents of rocks are 

 shown, their combination in rock structure 

 and examples of characteristic rocks, as 

 acid, subacid, basic, metabasic, etc.; while 

 structure and phase receive illustration 

 under metamorphism, shearing, crumpling, 

 foliation, lamination, ripple-marks, etc. 

 Many erystallographic drawings appear 

 throughout, and labels are sometimes very 

 elaborate, as take, for instance, this one 

 under pseudomorphism: 



Mould-Formation, with Removal of Pattern 

 Quartz Coating Galena. — Tliere has, in this speci- 

 men, been two successive depositions of Galena, 

 with investiture of quartz. After the removal 

 of the first formed crystals of galena, a second 

 and larger set of crystals of galena has been laid 

 down upon the first formed layer of quartz. 

 These in turn have been invested by a layer of 

 quartz, and thereafter have been themselves re- 

 moved; Leadhills, Scotland. 



The climax of excellence in the museum, 

 in the opinion of the writer, is reached in 

 the hall devoted to Scottish geology. The 

 exhibit here of rocks and minerals is re- 

 markably effective, and in its lithological 

 aspects quite extraordinary. Here are 

 gathered together the minerals of Scot- 

 land, views of its geological scenery^ with 

 a display of rock specimens, luminously 

 referred to position by maps, marked with 

 pins and numbers, correlated exactly with 

 the specimens of rocks near them. There 

 are also relief maps dissected, colored and 

 explained, and on the walls the fossils of 

 Scotland with a long series of prehistoric 

 flints, while upright A-shaped cases en- 

 gage immediate notice from interesting 

 and handsome specimens of geological 

 structure, mineral masses and lithological 

 phases contained in them. This hall con- 

 tains a wealth of Scottish mineral treas- 

 ures, and will reward the student by a 



