1833.] Continuation of Dr. Gerard’s Route. 143 
I do not therefore insert his table from the Philosophical Magazine now 
before me, but at once conclude with a general summary of the dilata- 
tions which our experiments in India have established, in a manner 
worthy, I hope, of entire confidence. 
Dilatations of metals determined at Calcutta. 
Standard 10 feet bar of the Trig. Survey, 1,001213 
Tron, < Duplicate of do. of English bar iron,.. 1,001210 }1,001215 
Wire-drawn rod, twenty-five feet,.... 1,001256 
Gotp, nearly pure, (10 feet long) ........ -s00- ..0--» 1,001438 
SILVER, containing one-twelfthalloy, (do.).......- .-..00.- 1,001904 
Copper, sheet, annealed, .......... CEO EY. VOSS cee e 1,001691 
Brass, wire-drawn, annealed, (25 feet) ..........s0000- 1,001906 
LEAD, one-inch pipe, (25 feet) .........eee005 oe se. 1,002954 
The apparatus used in the foregoing experiments is preserved, in case 
it should ever become a desideratum to try the expansion of other metals 
or substances by the same process. 
IV.—Continuation of Dr. J. Gerard’s Route with Lieutenant Burnes, from 
Bokhdéra to Meshid. 
[Extracted from letters to his brother Captain P. Gerard.] 
Mirabdd, 3\st July, 1832. We took leave of Bokhara on the 21st 
ultimo, and are now in a Tuirkoman village, about 36 miles distant, await- 
ing the arrival of the merchants, &c. who are to form the Kafila ; but we 
may be here long enough, as the Urganj army is still in our way. Ghos 
Bég sent for us before starting, and made us over to the Turkomans and 
Kafila bashz, with every demonstration of good will, and enjoining them 
to convey us safe to Meshid at their peril. * * * * 
The weather has been uniformly sultry ;—thermometer daily above 
‘100°, even as high as 110°, and our sitting room is but a few degrees 
cooler, but the extreme dryness of the air counteracts the sensation of 
heat. The nights have generally been pleasant and the mornings al- 
ways temperate ;—thermometer 66°. Though it is now the middle of 
August, the climate can scarcely be said to have changed, except that 
the nights are cooler. 
Meshid, 17th September, 1832.—Here we are safe in Persia, after a 
journey of no ordinary difficulty. We left the village (Mérabad) so 
long our prison, on the 16th of August, and crossed the Oxus on the 
following morning, intending (as we had believedupon faithless resolu- 
tions), to accomplish the trip in fifteen or sixteen days. Our first de- 
tention commenced at Sarjué on the bank of the river, but as this 
