CONTENTS. 
iv 
Agouktics. 4i Account of the Sirene, an Acoustic In- 
strument. 5. Voice changed by breathing Hydrogen. 
6. Humboldt on the Increase of Sound during the 
Night. 7. New Musical Instrument. 8. Method of 
playing the Violin and Violincello at the same time, IQ3, 194 
Mechanics. 9* Physical Strength of Men, - 195 
Hyorodynamics. 10. On the Application of a Jet of 
Water to drive a Water-wheel. 11. Perkin’s Experi- 
ments on the Compressibility of Water, - 195, 1£^ 
Magnetism. 12. Daily Variation of the Needle at Spitz- 
bergen. 13. Daily Variation of the Needle at Edin- 
burgh, - - - 196 , 197 
Meteorology. 14. Meteoric Stones. 15. Extreme Heat 
at Bagdad. 15*. Dreadful Storm in Kutch. 17 . Rain 
and Earthquake in Java, - 197, 198 
II. CHEMISTRY. 
18. Gliadine and Zimome. I 9 . Curious effect of mixing 
Guiacum with Wheat Flour, 20. Indigo. 21. Camphor. 
22. New Alkali called Brucine. • 23. Spontaneous Com- 
bustion of Cloth. 24. Morphia. 25. Rosin, I 98 , 200 
III. GENERAL SCIENCE. 
26 . Growth of the Uredo Nivalis, the colouring matter of 
Red Snow. 27. Description of Rare Plants in the Bo- 
tanic Garden at Berlin, 28. Sudden Change of Habit 
in an exotic Plant, 29. Geological Map of Germany. 
SO. Mr Knight on the difference between Spring and 
Winter felled Timber. 31. Population of Glasgow. 
32. Bristol Institution. S3. Society of Civil Engineers. 
34. Personal Conflict between Lieutenant Collet and a 
Tiger. 35, Remarkable Cascade in Bavaria. 36. Gol- 
den Image of Vishnu, - - 200, — 203 
Art. XXXVl. Patents granted in Scotland since 9th Febru- 
ary 1820, 
204 
