In this transcription, paired _underscores_ denote _italicised text_. A single underscore preceding curly brackets indicates that the bracketed character was subscripted, e.g. BaCl_{2}, and a ^ (caret) indicates that the following bracketed character was superscripted in the original text. The text contains typographic characters that will not necessarily display correctly with all viewing devices. If some of the characters look abnormal, first ensure that the device’s character encoding is set to Unicode (UTF-8). The default font might also need to be changed to a Unicode font such as Arial Unicode MS, DejaVu, Segoe UI Symbol or FreeSerif.…
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