THE PHYSICAL PROPERTIES OF METHYL-ALCOHOL. 



521 



curve registered observational errors rather than anything else, and that a small 

 constant correction applied to a' did full justice to our results. The final formula 

 adopted was 



log p = 1-4731 + 0-02649^ - 0-0000742* 2 . 



The following table gives the results of our final series of determinations; i.e., 

 the logg. of the observed p's, contrasted with the values calculated by means 

 of the formula. The column " Exp. — Calc." gives the correction to be applied 

 to the calculated logarithm of p to obtain log (p as found). The last column, 

 under Ap, gives the corresponding difference between the two values p them- 

 selves : — 





Logarithm of 





Ap in mm. of 

 Mercury. 



Temp. C. 







Exp. — Calc. 





Calculated 

 Tension. 



Observed Tension. 







4°15 



1-5817 



1-5761 



-0-0056 



0-6 



9° 



15 



1-7092 



1-7097 



+ 0-0005 



0-07 



9° 



95 



1-7293 



1-7318 



+ 0-0025 



0-4 



14° 



15 



1-8330 



1-8373 



+ 0-0043 



0-7 



19° 



15 



1-9531 



1-9542 



+ 00011 



0-2 



24° 



15 



2-0695 



2-0738 



+ 0-0043 



1-2 



29° 



15 



2-1821 



2-1837 



+ 0-0016 



06 



34° 



15 



2-2911 



2-2940 



+ 0-0029 



1-3 



39° 



15 



2-3963 



2-3947 



-0-0016 



1-0 



44° 



15 



2-4978 



2-4988 



+ 0-0010 



0-7 



49° 



15 



2-5956 



2-5936 



-0-0020 



2-0 



54° 



15 



2-6898 



2-6895 



-0-0003 



0-3 



59° 



15 



2-7802 



2-7792 



-o-ooio 



1-5 



64° 



•15 



2-8669 



2-8682 



+ 0-0013 



2-4 



65°15 



2-8837 



2-8847 



+ 00010 



1-8 



By means of the interpolation formula, given above, the table on the fol- 

 lowing page was calculated. 



The Specific Gravity of Anhydrous Methyl- Alcohol. 



For these determinations we used small cylindrical bottles of the form 

 represented in the figure on page 522. The body c holds about 20 c.c. ; the 

 stem o bears a millimetre scale ; 1 mm. corresponds to very nearly 001 c.c. 

 To ascertain the capacity at any mark and any temperature which it might be 

 convenient to use, we first determined the capacities for water of 14° *7 (the 

 " 15 " of a certain delicate thermometer) up to 0, 5, 10, 15, 20 mm. We then 

 determined the capacities for water up to mm. (directly or indirectly) at 

 exactly 0° (in melting ice), and at temperatures near 15°, 20°, 30°, 35°, 40°, 45°, 



