<p id="N10072" type="main">
<s id="N10075"><emph type="smallcaps">Titolo</emph>: <lb/>
<emph type="smallcaps">Data</emph>: da E 20. </s>
</p>
<p id="N10082" type="main">
<s id="N10085">H 21: è una lettera in data 27 maggio 1791, che non si pubblica e nella quale Fleurian <lb/>
de Bellevue chiede al V. notizie riguardanti ilavori da lui compiuti sulla tormalina. </s>
</p>
<p id="N1008B" type="main">
<s id="N1008E">E 20: è la minuta autografa, in data 10 giugno 1791, di una risposta alla precedente <lb/>
lettera, nella quale il V. espone le esperienze da lui compiute sulla tormalina: <lb/>
si pubblica per intero, rispettandone fedelmente la grafia. </s>
</p>
<p id="N10096" type="main">
<s id="N10099">E 21: è la minuta autografa di un’altra lettera del V. in data 13 giugno 1791: questa <lb/>
lettera presenta una introduzione concordante con quella di E 20, alla quale <lb/>
seguono, dopo pochi accenni alle esperienze sulla tormalina, considerazioni sull’u-<lb/>
niforme dilatazione dell’aria per il calore, sull’evaporazione ed ebollizione dell’ac-<lb/>
qua: per questa ragione si rimanda ad altro volume la pubblicazione di E 21. </s>
</p>
