51 
Dr Hamilton on the Diamoyid Mine of Panm. 
before examined, as it was lying in irregular heaps, as thrown 
out after examination. 
The Rajah has guards all around, and some watchmen attend 
the labourers ; but no great precaution to hinder smuggling is 
apparent to the visitor. The workmen I saw were Rajputs, and 
had every appearance of poverty. The men appointed to guard 
them were common soldiers, probably allowed two or three ru- 
pees (5 to shillings) a month, and such as in the Company’s 
government would be open to every sort of peculation. The 
barbarous severity of the petty chiefs, such as the Raja is, pro- 
bably, in a great measure, prevents illicit dealing. The whole 
diamonds are collected at one house, where they are weighed and 
«old to the merchants residing at Panna. The workmen are al- 
lowed three-fourths of the value of those about the size of a pea or 
still smaller ; two-thirds of the value of those about the size of a 
hazel nut ; and one-half of the value of those larger than a filbert, 
but few of these are found. Any man that pleases may dig, 
and it is said, that, on an average, about a thousand men are 
employed in the search. 
The rock immediately under the gravel and earth, among 
which the diamonds are found, is a white granular quartz, evi- 
dently of the same nature with the sandstone usual in this range 
of hills, but rather too hard to be cut for building. In many 
places, it is stained red, and contains more black spots or dots 
than usual. On the ascent of the hill, the rock is white free 
sandstone, very fit for building, 
Leny, March 1819. 
Art. IX . — Description cfthe Patent Sympiesometer or New Air 
Barometer, By Alexander Adie, F. R. S. Edin. Com- 
municated by the Author. 
My attention was first directed to the improvement of the Ba- 
rometer, with the view of rendering it susceptible of indicating 
any of those minute changes in the weight of the atmosphere, 
which might be supposed to arise from the action of the Suo 
and Moon. A very sensible instrument was obviously necessary 
