CJ44) 
The T'ube A D is divided into 3 lenghts 5 of which ( as in ordi- 
nary ones) BC is to lengthen or contrad;, as the Objedl requires: 
But A B is here added, that at A. you may put fuch Eye-glaffes 
as fliall be thought moft convenient, and to fet thera ftill at the 
diftance, moft proper for them. Indexes or Pointers^ which here 
are fupposd'd to be at B. which length alters alfo in refped of 
divers perfonsEyes. E. is a Screrv^ by which the Great Tube can 
be fixtfo, as by the help of the figures;, any fmaller part of it can 
immediately be found, meafuring only, or knowing the divi- 
[tons on BC, the diftanceof the obje^-glafs from the Pointers, 
F. is the Angular piece of wood, that lies on the ufper Screw of the 
Rejl. This is reprefented by Figure'). 
As for a Defcription of the Z^/^^ of this ingenioufly contrived 
and very curious Engine,, the Reader \s defir'd to look back to the 
before alledged Numb. 25, 
An Account 
of making a Dogg draw his Breath exaBly like a Witid-hroken ^ 
Horfe as it was devifed and experimented by Z)r.Richard Lower 5 
with fome of hisln&m£tive oifervations thereon. 
This Exferment was made before the R Soc. Oc^ob. 17. 1667, after it 
had been tryed hy the Author in private^ fome while before. The Acccoum 
cf it in his own "^ords and as follows. 
After I had often confider d the manner and way of Rejfiration^ 
and by many Obfervations been induced to believe^that ih^Dia- 
fhragmeis the chief Organxhexeoi^ I thought, there could be no 
way more probable to try it, then by breaking the Nerves y by 
which its Motion is perform'd: Which maybe eafily (as it was 
adually ) done after the following manner 5 
Firfl-) pierce the fide of the Anim J between the 6, and 7 Ribb 
in the middle of the Thorax^ juftover againft the region of the 
Heart, with a fmall Inciften-knife^ palfing the knife but juft into 
the Cavity of the Breaft . (which you may juftly know by finding 
no refiftance to the point of it ^ J then take it out, and put 
in 2.T>ire6lory or a fmall ^ill made hke it, and thruft it in about 
an inch^ direcfting the end of it toward the Sternum^ clofe to the 
infideofthe Breaft. Then cut upon it about an on the Inter- 
cojlal Mufcles 3 by which you may be fecuf d from touching the 
Lungs 
