274 Mr. Cavendish’s Experiments on the 
“ priai de me communiquer de quelle maniere il etoit venu a 
“ cet air, parceque je defirois de repeter l’experience avec ce 
Ci meme air: mais comme il ne m’a fourni aucune elucidation 
“ fur la caule vraifcmblable de la difference du relultat de nos 
64 experiences, et qu’il ne lui a pas plu de me communiquer fa 
“ maniere de produire l’air pur qu’il avoit employe pour ies ex* 
“ periences, m’ecrivant, qu’il s’etoit propofe u’en parler dansim 
4< ecrit public, la longueur ennuyante de ces experiences nous 
“ a fait prendre la refolution de differer leur continuation, pour 
46 obtenir une parfaite faturation de la leffive, jufqu’a ce que M. 
■ 6t Cavendish ait publie la maniere de produire fair pur, dont il 
• 4t s’efr fervi, nous contentant pour le prefent cf avoir vu, que 
j 
“ l’union du principe d’air pur et de la mofette produit de l’acide 
“ nitreux, fuivant la decouverte de M. Cavendish.” 
As 1 fhould be forry to be thought to have rehifed any ne- 
-eefiary information to a Gentleman who was defirous to repeat 
one of my experiments, and who by his fituation was able to 
do it with lefs trouble than any one elfe, 1 hope the Society 
will indulge me in adding a copy of my anlwer; that they 
may judge whether this is in any degree a fair reprefentation 
of it. 
41 TO M. VAN MARU M. 
“SIR, 
/ ’ * 
44 I received the honour of your letter, in which you inform 
4< me of your ill fuccefs in trying my experiment on the cou- 
<dephlogifticated air, inftead of that prepared from Dr. Priestley’s black pow- 
der, can in the lead: degree form an effential difference, as in the fame para- 
graph in which I mention my having ufed this kind of air in my firft experi- 
ment, I fay, that in my fccond experiment I nfed air prepared from turbith 
mineral. 
verfion 
