No. 394. ] NOTES ON EUROPEAN MUSEUMS. 769 
lection is especially rich in rare and showy minerals of the 
Urals and the Tyrol. The collection is installed in vertical 
wall and “A” floor cases, the case interiors being colored 
maroon. The specimens are mounted on red or black walnut 
blocks. The meteorite cases are kept dry within by means of 
open dishes of sulphuric acid. For the deliquescent Stassfurt 
and other salts, a square jar, ground at the top to a bevel and 
fitted with a glass lid, is employed, and the specimens so installed 
show to much better advantage than in the usual museum jar. 
The collection of single crystals (a very large and choice col- 
lection) is shown in short ‘“ A” cases which have a steep slope 
and are fitted with narrow step shelves. By such an installa- 
tion the eye of the observer can be brought close to the speci- 
men, a most desirable arrangement for the study of objects so 
small. The crystals are mounted on wooden stands of the 
usual type. In the general collection index fingers are used 
freely on the specimens to point out individual crystals. 
The collection is divided into the terminological, systematic, 
genetic, and technological collections. In the terminological 
collection are illustrated structure, color, form, and luster of 
minerals, crystal form, growth of crystals, inclusions, crystal 
aggregates, and pseudomorphs. The systematic collection is 
arranged according to Groth’s classification. The genetic 
series begins with the collection of meteorites, then follow 
rock-forming minerals and rocks, native salts, secondary min- 
erals, and ores. The technological collection is intended to 
illustrate ores and minerals of economic importance with their 
products. There are shown in order ores of gold, mercury, 
silver, lead, tin, bismuth, antimony, zinc, iron, cobalt, nickel, 
manganese, and aluminium; then a series showing minerals 
used in the arts, such as materials for making glass, magnesite, 
strontianite, saltpetre, uraninite, chromite, borax, asphalt, ozo- 
cerite, asbestos, talc, mica, graphite, lithographic stone, Ice- 
land spar, emery, tripoli, ornamental stones, and a series of 
gems showing the varieties of color exhibited by each species. 
Such a classification is well conceived and might be made most 
instructive if well executed, but, as is usual with such collec- 
tions, insufficient care has been bestowed on the installation, 
