CONBENWS, 
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Sketch of the Life and Writings of Ferdoosee. 
By SamvuEL ROBINSON, EisQyovees ecaaencpis eaaswsTaarers 1 
On Oil, and the Gases obtained from it by Heat. 
By Joun Dattoy, F. R. S. &e..e0..000 gibbaghoeberes . 64 
[Note on do.—page 527.] 
Some Observations upon the local prevalence of 
Idiotism, and its connection with Goitre. By Mr. 
KINDER WOOD. csscececcssescecenenscseneeseess Boacbewcmbatre 83 
Observations in Meteorology, particularly with 
regard to the Dew-point, or quantity of Vapour in 
the Atmosphere ; made on ihe Mountains in the 
North of England. By Joun Darton, F.R.S. &c. 104 
Tables of the various Species of Periodical Birds 
observed in the Neighbourhood of Manchester : with 
a few remarks tending to establish the opinion that 
the Periodical Birds Migrate. By Mr. Joun 
BLACKWALL,. cevecoccescncsvcccccncccsnesovcanccsccscoscesers 125 
_ Remarks on the Site of Troy and on the Trojan 
Plain. By Ropert Hype GREG, ESQ. seoseeeeeees 151 
On the Transverse Strain, and Strength of Ma- 
. terials, By Mr. EATON HODGKINSON...++eseeeeeees 225 
Observations on the Notes of Birds, including 
an enquiry whether or not they are Instinctive. By 
Mr. JouN BLACKWALL. PYTTTER I 289 
