10 Improvements in Physical Science [JAN. 
Genus 5. zirnconrpEs. (From zirconium.) 
Bodies whose Oxides are not decomposed by Chlorine, Iodine, or 
Carbon. 
Sp. 1. Yttrium. Sp. 3. Aluminium. 
2. Glucinium. 4, Zirconium. 
Crass III. CHRorcoLyTEs. 
Genus 1. cERIDES. (From cerium.) 
Bodies brittle and infusible at the Temperature at which Iron melts. 
Sp. 1. Cerium. Sp. 2. Manganese. 
Genus 2. sipERIDES. (From oidypos.) 
Bodies whose Oxides dissolve in Acids in a State of Purity, and 
form coloured Solutions only when concentrated, and whose Per-. 
oxides have not Acid Properties. 
Sp. 1. Uranium. Sp. 4. Nickel. 
2. Cobalt. 5. Copper. 
3. Iron. 
Genus 3. CHRYSIDES. (From xgucos.) 
Metals unalterable in the Air at all Temperatures. 
Sp. 1. Palladium. Sp. 4. Iridium. 
2. Platinum. 5. Rhodium. 
3. Gold. 
Genus 4. TITANIDES. (From ¢éitanium.) 
Infusible Bodies whose pure Oxides do not dissolve in Acids, and do 
not form with the Alkalies Compounds which can be considered as 
true Salts. 
Sp. 1, Osmium. Sp. 2. Titanium. 
Genus 5. cHRomIpEs. (From chromium.) 
Bodies infusible at the Temperature at which Iron melts, acidifiable- 
by Oxygen. 
Sp. 1. Tungsten. Sp. 3. Molybdenum. 
2. Chromium. 4, Columbium. 
Ill. AFFINITY. 
1. Effect of Trituration on Chemical Combination.—IJn the 
Annals, vii. 426, 1 have published a set of experiments by Mr. 
Link to determine what happens when dry salts, that mutually de- 
compose each other when in solution, are triturated together. He 
found that when the two salts were destitute of water of crystalliza- 
