1883.] On a Uniform Rotation Machine, Sfc. 445 



cannot be kept alive as long as when defibrinated dog's blood is em- 

 ployed ; (4) that no matter how long an experiment lasts the defibri- 

 nated blood, circulated again and again through heart and lungs, 

 shows no tendency to clot ; hence fibrinogen is not produced in those 

 organs. 



The question answered by the first of the above results was the one 

 for whose solution the research was undertaken. The experiments 

 show that, in spite of its highly developed extrinsic nervous appara- 

 tuses, the heart of the mammal does, so far as its rhythm is concerned, 

 in its own nervo-muscular tissues, respond to temperature variations 

 within wide limits (42° — 27° C), just as the frog's heart or that of the 

 embrj-o chick does. To account for the quick pulse of fever we, 

 therefore, need not look beyond the mammalian heart itself ; we 

 require no theoretical assumption of any paralysis of inhibitory, or 

 any excitation of accelerator car dio- extrinsic nerve-centres. 



January 18, 1883. 



THE PRESIDENT in the Chair. 



The Presents received were laid on the table, and thanks ordered for 

 them. 



The following Papers were read : — 



I. "Preliminary Paper on a Uniform Rotation Machine; and 

 on the Theory of Electromagnetic Tuning Forks.-" By R. 

 H. M. BosANQUET, St. John's College, Oxford. Communi- 

 cated by Professor H. J. S. Smith, F.R.S. Received De- 

 cember 20, 1882. 



(Abstract.) 



The primary object of the machine is the construction of standard 

 notes. It admits also of the accurate determination of tuning forks, &c, 

 having pitch near that of any standard note of the machine, besides 

 other applications. 



The machine consists of a three-crank axle with a fly-wheel. The 

 cranks are acted on by electro-pneumatic levers, the valves of which 

 control the wind supply as the slide-valve of a steam engine does the 

 steam. Two of these are acted on by a commutator on the axis ; 

 the third is connected with a clock which closes the circuit at every 

 second. The effect of this is to govern the machine, so that it will 



