466 ; Scientific Intelligence. {Dec. 
stated in the last number of the Phil. Mag. that on a trial with 
Woolf's engines (who uses steam of high pressure) the effect, 
compared with other engines, is as 46255 to 19897, with the same 
guantity of fuel. You mention in your Annals of Philosophy, &c. 
that Count Rumford found it decrease with heat ; but do not 
mention the rate. Is there any method of preventing the inerus- 
tation on the inside of steam engine boilers? What quantity of 
sugar may be obtained from a given quantity of starch? 
Iam, dear Sir, your most obedient, , 
LS; 
Dundee, Oct. 17, 1815. 
V. Royal Geological Sociely of Cornwall. 
Annual Report of the Couneil.—In presenting this Annual, Re- 
port the Council cannot resist the pleasure of congratulating the 
Society upon the active zeal with which the various objects of its 
research have been pursued, and the eminent and unexampled 
success which has attended its labours: two years have not yet 
elapsed since its establishment, and yet how much has heen 
effected! the cabinets are respectable, and in some departments 
even rich ; the library is stored with many splendid and instructive 
works, in the various sciences connected with geology; and the 
laboratory has been furnished with all the apparatus necessary for 
the pursuit of analytical mineralogy; numerous interesting and 
original memoirs have been read, and a very considerable mass of 
materials has been collected for the construction of a Geological 
Map of the County; the miner too has been enlisted into our 
service, and has presented us with much valuable information of a 
practical nature, which, when digested and arranged, may tend to 
solve the important problems connected with the structure of our 
metalliferous veins, and at the same time he has enriched our port- 
folios by the addition of many beautiful plans and drawings. 
While the objects of scientific research have been thus happily 
advanced, the interest of the miner has excited equal attention, 
and been promoted with equal zeal : the CEconomical Department 
of the collection is calculated to afford him much valuable instruc- 
tion, it will teach him the characters and appearances of the dif- 
ferent mineral substances employed in the various arts and manu- 
factures of the kingdom, and enable him to recognize them when- 
ever they may occur in his own districts, and thus open to him 
endless sources of profitable labour: the council therefore take 
this opportunity of soliciting the co-operation of the various mine 
agents, in order that they may more speedily enrich, and extend 
this most important part of the collection. Nor has the safety and 
lives of the miners been forgotten: it is with infinite satisfaction 
that the council are enabled to state that- the Tamping Bar com- 
posed of a metallic alloy, as suggested by Sir Rose Price, for the 
prevention of these fatal explosions which so frequently attend the 
use of iron instruments, through the humane and able exertions of 
