212 



Prof. Silas W. Holman on the Effect 



there is some mistake in the rejected group that I unhesita- 

 tingly lay it aside. I thus obtain, by the method of least 

 squares, for measurements 1 to 22 on dry air, fifth series, 



^ =l + 0-002751*-0-00000034* 2 , 

 Vo 

 between the temperature-limits of 0° and 100° 0. The last 

 column of the table, headed d, gives the deviations of the ob- 

 served means from the values of — , computed for the same 



Vo 

 temperatures t 2 by the preceding equation and given in the 

 ninth column. The average deviation of the means from the 

 equation is thus only 0*0003, or about 0*03 per cent., for the 

 first five means, the deviation of the sixth mean being ten 

 times the next greatest deviation. The average deviation of 

 the individual observations from their respective means, dis- 

 regarding the correction corresponding to the slight differences 

 of the observed temperatures for the mean, is 0'0012, or about 

 0*1 per cent. 



Carbonic Acid, C0 2 . 



First Series. — Twenty-one measurements were made in 

 January 1879, after the close of the fourth series on air, and 

 with the same apparatus, with the addition of the necessary 

 apparatus for holding the gas. The precision of the results 

 was less than in the fourth series for air, chiefly because of 

 the somewhat greater complication of the apparatus for the 

 supply of the gas. The results are of little value, but are 

 given as a check on the second series. The pressures were 

 about the same as in No. 49 to 98 of the fourth series on air. 

 The temperature t x of the first capillary was always 0° C, 

 The following Table IV. gives the mean results. The coeffi- 

 cient of expansion used was 0*003699, a value taken from 

 Hegnault's work by interpolation for the actual pressure p 2j 

 under which the expansion occurs. 



The column headed n gives the number of measurements 

 going to make up the corresponding means. 



Table IV.— C0 9 . First Series. 



11. 



t v 



5a. 



ni 



Computed 



ni 



8 



29-61 



1-103 



1-108 



5 



48-56 



1-178 



1-175 



8 



100-09 



1-324 



1-351 



