he absolute values being simply diminished by a constant
quantity 0.0056 to allow for the probable errors of his thermometry.
Above 100 deg. C., and for approximate work generally, the simpler
formula of Bosscha, similarly corrected, is probably adequate.

The following table of values, calculated from these formulae, is
taken from the _Brit. Assoc. Report_, 1899, with a slight modification
to allow for the increase in the specific heat below 20 deg. C. This
was estimated in 1899 as being equivalent to the addition of the
constant quantity 0.20 to the values of the total heat h of the liquid
as reckoned by the parabolic formula (5). This quantity is now, as the
result of further experiments, added to the values of h, and also
represented in the formula for the specific heat itself by the cubic
term.

SPECIFIC HEAT OF WATER IN TERMS OF UNIT AT 20 deg. C. 4.180 JOULES

+-----------+-------+--------+---------+----------+
| t deg. C. |Joules.| s. | h | Rowland. |
+-----------+-------+--------+---------+----------+
| 0 deg. | 4.208 | 1.0094 | 0 | 0 |
| 5 deg. | 4.202 | 1.0054 | 5.037 | 5.037 |
| 10 deg. | 4.191 | 1.0027 | 10.056 | 10.058 |
| 15 deg. | 4.184 | 1.0011 | 15.065 | 15.068 |
| 20 deg. | 4.180 | 1.0000 | 20.068 | 20.071 |
| 25 deg. | 4.177 | 0.9992 | 25.065 | 25.067 |
| 30 deg. | 4.175 | 0.9987 | 30.060 | 30.057 |
| 35 deg. | 4.173 | 0.9983 | 35.052 | 35.053 |
| 40 deg. | 4.173 | 0.9982 | 40.044 | |
| 50 deg. | 4.175 | 0.9987 | 50.028 | |
| 60 deg. | 4.180 | 1.0000 | 60.020 | |
| 70 deg. | 4.187 | 1.0016 | 70.028 | |
| 80 deg. | 4.194 | 1.0033 | 80.052 | |
| 90 deg. | 4.202 | 1.0053 | 90.095 | Shaw |
| 100 deg. | 4.211 | 1.0074 | 100.158 | Regnault |
| 120 deg. | 4.231 | 1.0121 | 120.35 | 120.73 |
| 140 deg. | 4.254 | 1.0176 | 140.65 | 140.88 |
| 160 deg. | 4.280 | 1.0238 | 161.07 | 161.20 |
| 180 deg. | 4.309 | 1.0308 | 181.62 | 182.14 |
| 200 deg. | 4.341 | 1.0384 | 202.33 | |
| 220 deg. | 4.376 | 1.0467 | 223.20 | |
+-----------+-------+--------+---------+----------+

The unit of comparison in the following table is taken as the specific
heat of water at 20 deg. C. for the reasons given below. This unit is