Transactions of the Royal Society (f Edinburgh, 349 
Lond. & Ed. and M. Rumkeu. In a Letter to Dr Brewster^ 
Sec. R. S. Edin.— P. 112-116. 
This interesting paper contains the elliptic elements of the co- 
met of Septembier 1822. It contains also observations of the 
transit of Mercury over the Sun, on the 3d November 1822, as 
observed both at Sydney and Paramatta; and likewise the ob- 
servations of the Winter Solstice of 1822, and of the comet of 
Encke. 
8. On a Remarhahle Case f Magnetic Intensity f a Chronb^ 
meter. By George Harvey, Esq. M. G. S. M. A. S. &Ci 
— P. 117-126. 
This ingenious and able paper will be regarded by philoso- 
phers as adding very important information to that which has 
already been laid before the public by Varley, Fisher, Barlow, 
and Scoresby. Mr Harvey found, by Coulomb’s apparatus, 
that a box chronometer exhibited singular proofs of strong 
and active magnetism. It contained a remarkable quantity of 
steel, and every part of it exhibited vigorous polarity. Every 
screw displayed its influence, and the frame alone contained ten 
large and several small screws ; and the same intense and ac- 
tive magnetic power was exhibited by the chain, the axles of 
the wheels and pinions, the arbor of the fusee, and the balance 
of its springs. Mr Cox, the agent for Arnold’s chronometer at 
Plymouth, remarked, when he saw this chronometer, that it ap- 
peared nothing less than a magazine of magnets. Mr Scores- 
by recommends platina, or an alloy of platina, for the balance 
of chronometers. Gold is said to be considered as well adapted 
for the balance spring. 
9. Remarks concerning the NaturalHisiorical Determination 
of Diallage. By William Haidinger, Esq.— P. 127-147. 
In this paper, the Green Diallage of Haiiy is demonstrated al- 
ways to be a composition of thin films of Hornblende and of Au- 
gite, sometimes pure, sometimes the two species blended with 
each other. Besides this, the paper contains a description of 
VOL. x. NO. 20. APRIL 1824. A a 
