Scientific Intelligence.— Natural Philosophy. 21$ 
some result which turns out, after all, mere assertion or as- 
sumption, or not deducible at all from the premises ; or, lastly, 
some obvious truth, in which you are surprised the author can 
discover any thing new or important. 
Having only just received this paper, our limits do not per- 
mit us to enter more fully into the particulars of it in the pre- 
sent Number. We shall just state, therefore, in proof of 
what we have said, one or two, as a specimen of the proposi- 
tions maintained there. 1. It is said, that, in the generator, or 
high-pressure boiler, the heat is greatest at the top, and de- 
creases towards the bottom, against which the flame and heat 
of the furnace are chiefly directed ; so that while the temperature 
of the upper parts of the boileris at 400°, that of the lower parts 
next the Are may, in extreme cases, be so low as 40°. 2. Al- 
though the water exposed in this manner to the intense heat of 
a furnace, remains permanently cold, yet, if any crack or open- 
ing should take place in the bottom of the boiler within which 
the water is pressed with a force of at least 400 lb. on the inch, 
yet no water will issue at the opening. The reason assigned for 
this, we are unable to comprehend, or to render intelligible. 
S. It is proposed to 64 pump back the heat 11 into the boiler, af- 
ter it has done its office of impelling the piston in the cylinder; 
to pump it back into the generator, and to cause it in this way 
to act again and again upon the piston ; so that, in this man- 
ner, the author, in the fervour of his imagination, thinks it but 
reasonable to expect, that an apparatus of this kind may be con- 
structed, which, when once sufficiently heated, will continue to 
move for* ever, and to drive machinery of itself, without any 
farther consumption of fuel. On looking into his description of 
this part of the apparatus, we And the plan consists merely in 
heating the water of the generator by the waste steam from the 
cylinder, — a plan which has been already frequently proposed, 
and which is indeed practised to a certain extent in every steam- 
engine in the kingdom. 
HYDltOGItAPHY. 
4. Marohia . — The 4 ‘ Marobia 11 is an extraordinary phenome- 
non, most probably deriving its name from Mare Ubbriaco, or 
Drunken Sea, as its movement is apparently very inconsistent. 
It occurs principally on the southern coast of Sicily, and is gene- 
rally found to happen in calm weather, but is considered as the 
