72 Phosphate of Iron.—On Correspondents.— Patents. 
PHOSPHATE OF IRON FOUND IN BRITAIN. 
Sir,—I perceive in Thomson’s Annals for May, that Doctor 
Bostock is named (with an appearance of some magnificence) 
as the discoverer of Phosphate of Iron in Britain—Suum cuique. 
That substance was long ago discovered in great abundance in 
forming the excavations for the West India docks, occupying the 
places of the roots of plants that had grown in the peat. Mr. 
Sowerby’s cabinet still contains the specimens—lIt also occurs on 
the rommons of Woolwich and Plumstead. 
PHILALETHES, 
ON CORRESPONDENTS. 
To Mr. Tilloch. 
Blair’s Hill, Cork, Jan. 4, 1819. 
Sir,—You will no doubt permit me to recall your attention to 
a letter signed ‘* Unus,” which appeared in your Magazine for 
last April, referring me to a ‘* Pocket Companion”’ for harmonic 
information. Not imagining that any writer, though anonymous, 
could venture intentionally to mislead me, or rather to mislead 
the public, when the means of almost instantaneous detection 
were in every man’s power, I ordered that work from London; 
and having lately perused it throughout, I can safely take upon 
me to assure you, that, so far from containing any harmonic in- 
formation, it can hardly be said to glance at this question at all. _ 
In future, therefore, I shall take no notice of any anonymous 
production which, (like that of “ Unus’’) does not in itse/f im~ 
mediately bear upon my subject. ’ 
I am, sir, your most obedient servant, 
Henry UPINGTon. 
LIST OF PATENTS FOR NEW INVENTIONS. 
To Denis Johnson, of Long Acre, Middlesex, coach-maker, 
for an invention communicated to him by a certain foreigner re- 
siding abroad, of a machine for the purpose of diminishing the 
labour and fatigue of persons in walking, and enabling them at 
the same time to use greater speed, which said machine he in- 
tends calling The pedestrian curricle-—Dated 22d Dec. 1818.— 
6 months allowed to enroll specification. 
To John Ruthven, of the city of Edinburgh, printer, for his 
improved drag for coaches, carriages, or other vehicles, which ope- 
rates by raising a wheel or wheels off the ground from the out- 
side of the coach, carriage, &c. without stopping the horses.— 
23d Dec.—4 months. 
_ To Alexander Adie, of the city of Edinburgh, optician, for his 
improvement on the air-barometer, which improved instrument 
is to be called a Sympiesometer.—23d Dec.—2 months. 
To 
