Media for the Cultivation of the Bacillus of Tubercle. 187 



activity of, e.g., the triceps, muscle can be evoked is separate from 

 (that is to say not the same as) that area whence excitation evokes 

 contraction of the triceps {or of that part of the iriceps, inhibition of 

 which is now referred to). On the other hand, the area of the 

 section of the internal capsule, whence inhibition of the muscle is 

 elicited, corresponds with the area whence contraction of its antagon- 

 istic muscles can be evoked. Yet synchronous contraction of such 

 pairs of muscles as gastrocnemius and peroneus long as is obtainable 

 from the cortex. 



The observations make it clear that " reciprocal innervation " in 

 antagonistic muscles is obtainable by excitation of the fibres of the 

 internal capsule. It is probable, therefore, that the inhibition elicit- 

 able from the cortex cerebri is not due to an interaction of cortical 

 neurons one with another. The variety of nervous reaction in which 

 I have been able to establish existence of the reciprocal form of 

 muscular co-ordination is now pretty extensive. In some the condi- 

 tion described in the previous (3rd) Note (the state shewn to ensue 

 upon removal of the cerebrum, and in that N ote spoken of as " decere- 

 brate rigidity 1 ') was conducive to the result ; in others the cerebrum 

 was of course not removed. The reactions examined for the pheno- 

 menon with positive result include those initiated by excitation of 



(1) the skin and skin nerves (with " decerebrate rigidity "), 



(2) the muscles and afferent nerves of muscle (with " decerebrate 



rigidity "), 



(3) the dorsal (posterior) 'columns of the cord (with v ' decerebrate 



rigidity "), 



(4) of the cerebellum (with " decerebrate rigidity"), 



(5) of the crusta cerebri (with " decerebrate rigidity"), 



(6) of the internal capsule, 



(7) of the optic radiations, 



(8) of the Roland ic cortex, 



(9) of the occipital (visual) cortex, 



C. S. S„ November 3, 1897, 



"'On certain Media for -the Cultivation of the Bacillus of 

 Tubercle."* By Arthur Ransome, MJX, F.R.S, Re- 

 ceived November 1&,— Read November zo., 18-97, 



In May, 1894, a conrmunication was made to the Society bj Pro- 

 fessor Dele pine and myself, " On t he Influence of certain Natural 

 Agents on the Virulence of the Tubercie-Bacillns. 



* By permission, of the Royal College of Physiciaas, this research, which 

 forms a portion of the Weher-Parkes prke essay, is communicated to the Royal 

 Society before publication. The cost of the inquiry is defrayed by the Thrust&n 

 prize, presented to the author this year by G-onville and 'Caius College, Cambridge. 



p 2 



