INDEX. 525 
Dew-point, observations om its variation in ascending 
mountains, 109, et seq. 
Drying power of the air, table to ascertain the, 124. 
E. 
Experiments on the extension of bodies, 255, 256, 257,— 
to find the situation of thé neutral line in the bending 
of bodies, 268, 269, 270. 
G. 
Gas, new one from oil, called superolefiant, 73. 
Gases combustible from oil are four, superolefiant, carb. 
hydrogen, carbonic oxide, and hydrogen; incombustible 
are two, carbonic acid, and azote. 81. 
Goitre frequent where idiotism is endemic, 88—prevalent 
in some situations where idiotism does not prevail, 92. 
Goitrous tumoar, of limited growth in England, 80-—its 
appearance upon dissection, 97. 
Grea, Robert Hyde, Esq., remarks on the site of Troy, 
151—on the round towers of [reland, 332. 
GRELLEY, observations on the family of, 473. 
a 
Head, of the Cretin, analagous to the hydrocephalic, 100. 
Henry, William, M. D. F.R.S. on the analysis of the 
compounds of nitrogen, 499. 
Hopcxkinson, Mr. Eaton, on the transverse strain and 
strength of materials, 225. 
I 
Idiot, goitrous, frequent in alpine regions, 84. 
Indigo, its nature and properties, 427. 
