944 SEC. 18. BIOLOGY. 



3752. Circulation Thermometers, in pairs, 12" long, 

 divided from 35 to 45 centigrade. May be read to ^ of a 

 degree. T. Hawksley. 



3752a. Dupre's Thermometer, with spiral bulb and silver 

 reflector, for ascertaining the temperature of the surface of the 

 tody. T. Hawksley. 



3752b. Fair of Clinical Thermometers. E. Cetti $ Co. 



3752c. Three Clinical Thermometers, in cases. 



E. Cetti $ Co. 



1037. Two Thermometers, on the plan of Virchow, for 

 physiological investigation. 



Will. Haak, Neuhaus am Rennweg, Thuringen. 



1042. Two Thermometers, for medical purposes, on the 

 plan of Traube, divided in tenths from + 25 to +45 C. 



Will. Haak, Neuhaus am Rennweg, Thuringen. 



VI. APPARATUS FOR INVESTIGATING THE 

 FUNCTIONS OF CIRCULATION AND RESPIRATION. 



3753. Hermann's Heart Pump. 



Prof. Dr. L. Hermann, Zurich. 



This apparatus, exhibiting the action of the auricle, may be applied in con- 

 nexion with Weber's model of the circulation of the blood. The auricle (the 

 narrow chamber of the pump), without entrance valve, works in such a 

 manner that the heart receives blood from the veins both during the systole 

 and the diastole of the ventricle (the wide chamber). When the play of the 

 auricle is prevented, by shutting off its piston from the lever, the heart receives 

 tlood only during the diastole of the ventricle. 



3957a. Prof. Rutherford's Model of the Circulation for 

 explaining the Blood Pressure and the Pulse. 



Prof. Rutherford. 



Model of the circulation for [explaining the blood pressure and the pulse. 

 The tubes are filled with water. The heart is represented by an elastic pump. 

 The apparatus is fully described in the Journal of Anatomy and Physiology, 

 Vol. VI., p. 249. 



3754. Apparatus for Artificial Respiration. 



Prof. Strieker, for the Institute for General and Expe- 

 rimental Pathology, Vienna. 



The apparatus consists of clockwork set in motion by two steel springs, 

 each five centimetres wide, and 598 centimetres long. The clock moves 

 bellows, through which an animal, narcotized for the experiment, can receive 

 sufficient air to maintain circulation. 



