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“ vibration,” “ oscillation,” “ rotation,” or as fixed by their 
balanced forces of attraction and repulsion, they are in each 
case absolutely beyond the grasp of the mathematical 
investigator, however profound he may be, because he has 
not the shadow of any ground for assigning either size, 
motion , or force to the minute parts of matter apart from 
its aggregate forms, and all we can even know on these 
obscure matters must be inferred from observed physical 
effects. 
For reasons which he states the Author dissents from the 
dynamical theory of heat, and ventures to maintain the 
theory of a calorific element having not only the properties 
sui generis ascribed to it by the old school — Boerhaave to 
Dalton — - but also as being the real source of all other forms 
of heat, and likewise as constituting in itself the essence of 
the elastic force in bodies. 
“ Variable Star Ephemeris for 1867, calculated from the 
Elements given in Dr. Schonfeid’s Catalogue,” by J. R Hind, 
F.R.S., & c., Superintendent of the Nautical Almanac, and 
Honorary Member of the Society. 
The times are those of Maxima unless otherwise stated. 
Ii Androm. January 28. 
T Piscium Max. April 4 '4, and August 28 , 8. 
Min. June 25-4, and November 18*8. 
S Piscium .....February 12-4. 
R Piscium 1866, Dec. 17, and 1867, Nov. 29. 
R Arietis February 19-3, and August 23*5. 
o Ceti November 25*9. 
R Persei June 29. 
R Tauri < September 15*7. 
S Tauri May 21. 
R Orionis August 22. 
R Aurigse December 6. 
R Geminorum February 16*5. 
