Pop. of Melbourne with its suburbs (1891) = 490,912 = (4) Ou{r} (9) {B}iggest (0) {C}ity's (9) {B}uildings (1) {d}ecidedly (2) u{n}equalled. The "City" contains 73,361 = (7) {G}reat (3) {M}elbourne (3) {M}akes a (6) {Ch}ief (1) {T}own. Pop. of Sydney (1891) = 386,400 = A (3) {M}ost (8) {V}aried (6) {Sh}eltering (4) Ha{r}bour (0) Ha{s} (0) {S}ydney. Pop. of Hobart (Tasmania), 1891 = 31,196; (3) {M}any (1) {T}asmanians (1) Ea{t} (9) Ho{b}art's (6) {J}am. Pop. of Auckland (New Zealand), with suburbs, in (1891) = 51,287; (5) A{l}l (1) {Th}e (2) I{n}habitants (8) O{f} (7) Au{ck}land. SPECIFIC GRAVITIES. The Specific Gravity is the relative weight of a body compared to an equal bulk of some other body taken as a standard. This standard is usually water, for all liquids and solids, and air for gases. 1. Gold 19.2--{D}ollars {B}uy {S}u{n}dries.--Gold is made into money. The specific gravity of gold is 19.2; that is, nineteen and two-tenths. The initial consonants of the phrase "{D}ollars {B}uy {S}undries" express through "D" and "B" the figures 19. The "S" of "Sundries" expresses the decimal point, and the first subsequent consonant "n" expresses the decimal two-tenths. 2. Silver 10.4--{Th}e {S}ilver A{s}saye{r}. 3. Platinum 21.5--U{n}usually {D}uctile {S}o{l}id.--Platinum is the most ductile metal known. 4. Lead 11.3--{Th}e {T}in {S}{m}ith.--Lead is used to solder tin. 5. Mercury 13.5--{Th}e {M}ercury {S}o{l}d. 6. Copper 8.9--{V}iew a {Sp}ire.--Copper points the lightning rods. 7. Iron 7.7--Hoo{k} {S}{k}illet.--It means hang up an iron pot. 8. Zinc 6.9--A {Sh}eet {S}u{p}ply.--Zinc is rolled into sheets. 9. Antimony 6.7--{G}erman {S}ee{k}er.--Antimony was discovered by a German monk. 10. Calcium 1.0--Whi{t}e {C}eiling.--Calcium is used in white-washing. RIVERS. Mississippi (4,382 miles long).--{R}ushing {M}ississippi's wa{v}es E{n}croach. --The Mississippi River frequently overflows its banks. Nile (3,370 mi.) --(3) {M}ighty (3) {M}editerranean's (7) {G}reatest (0) {S}tream. Volga (2,400 mi.) --I{n} {R}ussia's {S}oil {S}uperior. --The Volga is the largest river in Russia, and, in fact, the largest in Europe. Ohio (1,265 mi.) --{Th}e Ohio {N}ow {Sh}ips {L}ighters. Loire (530 mi.) --{L}oire's {M}ajestic {S}weep.