207 
of Geelong , Port Phillip. 
It will be at once perceived upon reference to the pre¬ 
ceding table, that no specimens were sent me of several 
extensive natural orders, which form remarkable pecu¬ 
liarities in the Australian Flora, such as Dilleniaccoe , 
Proteacea ?, Rhamnece , Rubiacece , &c., and very few 
specimens of Mi/rtacecn, Epacridece , Rutacece , and Thy* 
melece . Graminece , Juncece , and Restiacece are also 
omitted. Future collections may enable me to observe 
upon these. 
Many of the Geelong plants are common to all 
Tasmania ; as Kennedya prostrata , Cardamine hetero- 
phylla , Bursaria spinosa , Hypericum involutum , Oxalis 
microphylla , and many others. 
A few I have seen only on the north coast, as Tetra - 
ciliata , Lavatera plebeia , Brunonia australis , 
Burchardia umbellata , and one or two others. 
I shall resume this subject as soon as I have additional 
materials from Port Phillip; merely observing, that my 
own collection during a short visit to the south coast of 
New Holland, in March, 1835, shows about the same 
result as respects the comparative numbers peculiar to 
each colony. 
Art. V. Description of the Instruments employed in the 
Magnetical Observatory , Tasmania. By Lieut. J. H. 
Kay, R.N., II.M.S. Terror , Director of the Observ¬ 
atory. 
The elements by which the terrestrial magnetic force is 
usually measured are three in number, and are designated 
as the Declination or Variation, the Inclination or Dip, 
and the Intensity : the variations to which this force is 
subject, at a given place, may be classed uuder three 
heads ; viz.—1. The irrcgxdar variations, or those which 
