K I. A- PEOC.-SER.II. 
VOL I. PLATE XX VL -SCIENCE. 
Fig.l 
Section of Apparatus, showing Valves. 
For large animals it might be necessary either to have the aperture at A smaller than any other of 
the valvular apertures, or else to have ihe valve V surrounded by a graduated spring, so as to obviate 
the tendency of tlie air to pass directly from V" to V. With small animals, as rabbits, I have found 
the pressure of the air in the upper chamber quite sufficient. — N. F. 
Fig. 2. 
Apparatus Mounted, showing Elastic Bands and Treadle. 
DR FURLONG-INSTRUMENT FOR KEEPING UP ARTIFICIAL RESPIRATION. 
