410 On the Principles of Security in 
lonnade : all seems destined for a residence. If the whole is uot 
colossal, it is nevertheless very large. A portico 150 feet long, 
supported by ten columns, forms the entrance: this is preserved 
almost entire. ‘T'wo door- ways lead from the porticos into the 
interior of the building. By the middle door-way, which is the 
largest, we enter a vestibule supported by six columns; beyond 
this several doors open from the halls and apartments. ‘The 
door-way of the portico on the left also leads iuto a hall, beside 
which are several other halls, and further on some snialler apart- 
ments. The right side seems to have been arranged in the same 
way, but the whole of it is in ruins. The whole building was 
therefore composed of three parts, independent of each other, 
but united by the grand entrance portico. This palace differs 
from the rest also in so far as it is without those historical or 
religious representations which cover their walls. We must 
conclude, however, that if it has not been the residence of 
kings, it must be at least admitted that it was inhabited by some 
grandee of the empire *. 
[To be continued. ] 
LXXXIV. On the Principles of Security in Sir Humpary 
Davy’s Lamp. By J. Murray, Esq. 
To. Mr. Tilloch. 
Sir, — Ix page 319 of the Annals of Philosophy, an anonymous 
correspondent attacks the security of Sir H. Davy’ s safe-lamp : 
1. Because the Philosophical Magazine approves; and, 2. Be- 
cause the principle on which its safety rests has not been de- 
veloped. You will, sir, no doubt, allow this writer whatever be- 
nefit his objections may claim from the first. I shal] endeavour 
ta relieve the second ground of his scruples, premising that it 
appears to me unwise and unbecoming to indulge in scepticism 
because the principles of the phenomenon are ‘veiled from ken. 
In the needle, the polarity is palpable to sense—the cause un- 
known. In the case of this curious instrument, has it not un- 
dergone “ the torture of the fre?” | lament to see the remarks 
of Dr, Reid Clanny, and the mode he has adopted in intro- 
ducing himself to public notice—whatever analogy may obtain 
in the lamp constructed by Stephenson and the first projection 
of Davy, there is no semblance whatever between the lamp of 
Dr. Reid Clanny and the latter. 
* For the beautiful engraving of this building which accompanies the 
present number, we are indebted to the kindness of Mr. C. Taylor, of 
Hatten Garden. It is one of the many elegant plates which embellish the 
work entitled Eeyrr, now publishing by Mr. Taylar. 
; When 
ne 
