114 Onthe Sleam-Vessel between London and Exeter. 
known to be more fusible than the primitive earths; the metals 
are more fusible than the earths; and the diamond, along with 
carbon in its other purest forms, appears to be really the only 
exception ; and it is probable that this is oniy a seeming one, 
for it is scarcely possible to expose these bodies to the heat of 
the compound blow-pipe, without at the same time burning 
them up: could the heat be applied without exposing them to 
the contact of oxygen, is it not probable that they also would 
be added to the list of fusible bodies ? 
Yale-College, May 7, 18.2. 
To the foregoing (which has been printed from the published 
Transactions of the Connecticut Academy) the following P. 8. 
was added in manuscript: 
«‘ P.S.—In subsequent experiments gold, silver, platina, and 
most of the metals were not only volatilized but burnt with pe- 
culiar flames.” 
Some of my readers may be inclined to think that the facts 
do not warrant all that Mr. Hare has stated respecting Dr. 
Clarke’s claim as an inventor. On that point I shall give no 
opinion ; but it should be observed that in Mr. Hare’s apparatus 
the gases are not in mixture till they are brought together at the 
piece H. 
By Mr, Hare’s arrangement it is obvious that the operator is 
completely secured against any danger from an explosion; and 
it must appear equally obvious to any person who shall consider 
the subject, that by having two condensing vessels for the gas~ 
reservoirs B and C, every result can be obtained which the united 
gases from one vessel can possibly yield: for, by means of the 
cocks at f the efflux of the gases may be regulated, as remarked 
by Professor Silliman, till any required degree of mixture or effect 
is produced.—A. T. 
XV. On the Steam-Vessel proposed to be employed between 
London and Exeter. By A CorresPONDENT. 
To Mr. Tilloch. 
Stra, — Havine heen long of opinion that vessels propelled by 
steam may be used with advantage for the general coasting trade; 
I have at length determined, in conjunction with’ some friends 
who are of the same opinion, forthwith to establish a vessel for 
conveyance of goods and passengers from London to this port. 
The particular advantage such an establishment would have here, 
over vessels of the ordinary description, is the degree of cer-, 
tainty attending the setting out and arrival ; the want of which, 
in 
