Occasional Notes. 385 
though not in the State, crushes over 700 tons per diem, 
having 240 stamps, and rock of medium hardness. No 
mill of any pretensions to efficiency is without rock- 
breakers, and the breaking of the quartz by hand would 
be considered quite old-fashioned, as would the use of 
hides, etc., instead of copper amalgamated plates, and 
Frue vanners, or their equivalent. Our mechanics pro- 
bably build, as they claim to do, the best quartz mills in 
the world, having had over thirty years experience over 
a wide range of ores, and varieties of quartz, etc. With 
these exceptions I consider the article in question, very 
well selected and arranged." 
» 
A mimetic Caterpillar.- One of the most curious of 
these peculiarly mimetic forms of life, has recently been 
presented to the Museum by Mr. A. C. L. Campbell, 
who obtained it at the Canal Polder. The body of the 
caterpillar which is nearly i| inches in length, is com- 
pletely hidden beneath a lateral and dorso-lateral series 
of lobe-like tufts, .seven of which are placed along each 
side of the body, the four longer and larger lobes being 
arranged above the others and alternating with them so 
as to form a zig-zag line. The lobes are cylindrical, 
and from \ to f inch in length, and consist of a dense 
mass of short close hairs arranged along a fine thread of 
the body substance of the caterpillar, among which are 
thickly interspersed long and fine hairs, the whole 
having somewhat of the form of a small stem of fine 
moss interleaved with fine bristles. The prevailing 
colour of the short hairs is a fine tile-red, but along one 
side of each lobe and also forming a ring around each 
tuft at a short distance from the tip, the hairs are black, 
