APPENDIX. 295 
Receiver, then I tied long Pieces of Pack- 
thread to the Top of each Wire, whereby 
pulling only one of thpfe at a time, the Pow- 
der fell then only into one Tube. I find thefc 
very ready ways to make thcfe Experiments. 
Experiment V. 
A S this wonderful and important Fluid 
the Air is found to be very operative 
in every part of Nature, whether animal, ve- 
getable or mineral, fo we cannot eafily find a 
larger Field, for making Variety of Experi- 
ments, or wherein we may reafonably hope to 
have our Refearches rewarded with further 
and more important Difeoveries ; particularly 
in relation to the great Ufe of ir, to the Life 
and Support both of Animals and Vegetables^ 
when pure and uncontaminated, without 
which it is foTar from being beneficial, that 
it is noxious to them. ^ 
I will here therefore fubjoin fome Experi- 
ments which Mr. Profefibr Mmkhenbroek 
made, with Variety of di'crvercent Mixtures 
both in the open Air and in Vacuo \ an Ac- 
count of which he has given in his Jlddita.. 
merit a ad Tentainina Experimentorum natupa- 
V , XT 4 hum 
