22 



91. Apparatus used by Dr. Warner in his investiga- 

 tions on the movements of the limbs. 



The apparatus consists of : 



Dudgeon's sphygmograph. 



Set of tambours in case, with electrical connections. 



Electrical apparatus for enumerating combinations and series 

 of movements in the various parts of the human body. 



Recording drums to be driven by clockwork, with wells and 

 syphon tubes for recording. In mahogany case. The apparatus 

 is referred to in Warner's " Physical Expression, its Modes and 

 Principles/' 



Lent by the Government Grant Committee of the Royal 

 Society. 1888 & 1890. 



iii. Apparatus for Experiments on the Circulatory 

 Organs. 



92. Pair of levers for experiments on the frog's heart. 



Lent by Dr. T. Lauder Brunton, F.R.S. 1876. 



This very simple apparatus for demonstrating the phenomena 

 of the frog's heart-beat, even to considerable numbers of people, 

 consists of a small base plate of tin or glass, four inches long by 

 three wide. At one side of the end an ordinary cork cut square 

 is fastened so that half of it projects over the end. -A pin stuck 

 horizontally into this serves as a pivot for a little slip of wood 

 three inches long, a quarter of an inch broad, and one- eighth of 

 an inch thick. To one end of this piece of wood a long straw is 

 fastened by sealing wax, and a disc of paper is similarly attached 

 to the other end of the straw so as to render its movements con- 

 spicuous. The frog's heart rests upon the plate under the piece 

 of wood and thus makes the straw rise and fall with its contrac- 

 tions. To counterbalance the wood and straw and prevent them 

 from pressing unduly upon the heart a small clamp is attached 

 to the free end of the wood. By placing the plate alternately 

 over a lamp and over pounded ice the effects of heat and cold, and 

 by applying solutions of various drugs to the heart, the effects of 

 poisons can be shown. 



93. Apparatus for studying the contraction of the 

 frog's heart. Constructed by E. S. Stohrer. 



From the Physiological Institute, Leipzig. 

 E. 248. 1877. 



The apparatus consists essentially of two cannula^ one inserted 

 into the vena cava, the other into the aorta of the heart under 

 investigation. This is then fed with a mixture of serum and 

 salt solution, and the pressure exerted by each contraction 

 measured by a manometer and recorded graphically on a drum. 



