Vill. CONTENTS. 
Page 
Cursory Remarks on the Mineral Substance, called 
tn Derbyshire, Rotten-Stone. By William Martin, 
F. L. &. Oeianwwas cdwelhn We ska moet sea ve Radetdadaucachsnassnes 313 
On National Character. By Thomas Jarrold, 
mM. D. SOPOT H EEE REET OOEEES ESE HET OH ONE HEHE TERETE OEOSEE SEES SEED 328 
Observations on the Ebbing and Flowing Well at 
Giggleswick in the West-riding of Yorkshire; with a 
theory of Rectprocatimg Fountains. By Mr. Jobn 
Gough. Ina Letter to Drs Holmesecesecerrsseecsereerees 354 
Description of an Eudiometer, and of other Appa- 
raius employed in Experiments on the Gases. By 
W. Henry, M. D. F, R. S. RECuaeseescnnsenvecvuswasudens’ 384 
4 Memoir on the Uric Acid. By W. Henry, 
M, D. B. R. S; &e. SOTSOT SCRE SEH EHH TFETEM SHER ORETHEEH EEE EEE 391 
A Demonstration of Lawson’s Geometrical Theorems. - 
By the late Rev. Charles Wildbore. Communicated by 
Mr. Mabbott to Mr. Ewart, and by him to the Society. 414 
Remarks on the Summer Birds of Passage, and on 
Migration in general. By Mr. John Gough. Com- 
municated by Dr. Holme.  csscsssescescceseecevececesessers 403 
ERRATA. : 
Page 28 line 24, for 30, read .30. 
76 line 18, for columen, read presidium. 
92 line 22, for verb, substantive, read verb-substantive. 
101 line 2, at theend, insert “of Language.” 
123 line 19, for “‘ direction AB,” read “ direction AD.” 
213 line 9, read “If D bea comparatively soft non-elastic body.” 
For other Errata between pages 116 and 215, see page 258. 
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