1866.] On a Substance, resembling Quinine^ in Animals, ^c. 73 



height, which is fixed upon its vertical axis of rotation, and is enclosed in 

 an outer chamber, containing water in such quantity that the lower ex- 

 tremity of the cup dips below its surface. The upper edge of the rotating 

 cup is, in this application, surrounded by a stationary ring armed with 

 vertical vanes, by which the overflowing liquid is arrested and directed 

 downward, causing it to fall through a space or zone which is traversed 

 by a number of radial and vertical blades projecting from the external sur- 

 face of the rotating cup, which, in striking the falling liquid, project it with 

 considerable force against the sides of the outer vessel, at the expense of a 

 corresponding retarding effect on the cup, increasing its regulating-power. 



The cup-spindle carries at its lower extremity a pinion, which gears into 

 two planet-wheels at opposite points, which on their part gear into an 

 inverted wheel surrounding the whole, which latter is fastened upon a 

 vertical shaft in continuation of the cup-spindle, and is driven round by the 

 engine in the opposite direction to the motion of the cup. The two inter- 

 mediate or planet-wheels are attached to a rocking frame supported, but 

 not fixed, upon the central axis, which wheels, in rotating upon their studs, 

 are also free to follow the impulse of either the pinion or the inverted 

 wheel to the extent of the differential motion arising between them. The 

 rocking frame is connected to the regulating valve of the engine, and also 

 to a weight suspended from a horizontal arm upon the valve-spindle, 

 tending to open the valve and at the same time to accelerate the cup to the 

 extent of the pressure produced between the teeth of the planet-wheels and 

 the pinion, while the engine is constantly employed to raise the weight 

 and to cut off the supply of steam. The result is that the engine has to 

 conform absolutely to the regular motion imposed by the cup, which will 

 be precisely the same when the engine is charged with its maximum or its 

 minimum of resisting load. 



The paper shows that the action upon the valve must take place at the 

 moment when the balance between the power and load of the engine is 

 disturbed, and that the readjustment will be effected notwithstanding a 

 resistance of the valve exceeding 100 kilogrammes — a result tending towards 

 the attainment of several important objects. 



II. " On a Fluorescent Substance, resembling Quinine, in Animals ; 

 and on the Rate of Passage of Quinine into the Vascular and Non- 

 vascular Textures of the Body.'' By H. Bence Jones, M.D., 

 r.E.S., and A.DuPRE, Ph.D., F.C.S. Beceived March 14,1866. 

 Part I. 



On a Fluorescent Suhstancey resembling Quinine, in Animals. 

 The term fluorescence in the last few years has found a place in physio- 

 logical works because different substances that occur in the body have been 

 said to possess the property of fluorescence. Of these the solution of bile- 

 acids in concentrated sulphuric acid, the white of egg when kept for a 



H 2 



