The quality of this research in the 1860s can be appraised by the fact that their determined density differs by less than 0.1 g/cm³ and the melting point by less than 1 °C from the presently accepted values.
19 世纪 60 年代的这项研究的质量值得肯定：因为他们确定的密度与目前的公认值相差小于 0.1 g/cm³，而熔点则相差小于 1 °C。