682 FUNCTIONS OF THE CER EBRO -SPIN AL NERVOUS SYSTEM. 



average proportion was, therefore, 1 to 5.97; the highest being 1 to 5.16, 

 and the lowest 1 to 7.44. It is curious that this last was in the individual 

 which had the largest Cerebellum of the whole; but the proportional weight 

 of the Cerebrum was still greater. Bringing together the results of these 

 observations, they are found to be quite opposed to the statement of Gall. 

 The weight of the Cerebrum, reckoning the Cerebellum as one, is thus ex- 

 pressed in each of the foregoing descriptions of animals : 



Average. Highest. Lowest. 



Stallions, 7 07 7.46 6.25 



Mares, 6 59 7.00 5.09 



Geldings, 5.97 7.44 5.16 



The average proportional size of the Cerebellum in Geldings, therefore, is so 

 far from being less than that which it bears in entire Horses and Mares, that 

 it is positively greater ; and this depends not only on diminution in the rela- 

 tive size of the Cerebrum, but on its own larger dimensions, as the following 

 comparison of absolute weights will show : 



Average. Highest. Lowest. 



Stallions, 61 65 56 



Mares, 61 66 58 



Geldings, 70 76 64 



The difference is so remarkable, and appears, from examination of the indi- 

 vidual results, to be so constant, that it cannot be attributed to any accidental 

 circumstance arising out of the small number of animals thus examined. 

 The average weight of the Cerebellum in the ten Stallions and twelve Mares 

 is seen to be the same, and the extremes differ but little in the two ; whilst 

 the average in the Geldings is more than one-seventh higher, and the lowest 

 is considerably above the average of the preceding, while the highest far ex- 

 ceeds the highest among the entire Horses. It is curious that Gall would 

 have been much nearer the truth, if he had said that the dimensions of the 

 Cerebrwn are usually reduced by castration ; for it appears from the follow- 

 ing table that such is really the case : 



Average. Highest. Lowest. 



Stallions, . ... 483 485 350 



Mares, 402 432 336 



Geldings, 419 566 346 



The weight of the largest Cerebrum of the Gelding is far above the highest 

 of the Stallions ; but it seems to have been an extraordinary case, as in no 

 other was the weight above 490 gr. If this one be excluded, the (ii-rriit/r 

 will be reduced still further, being then about 412; this may be seen, by 

 looking over the whole table, to give a very fair idea of the usual weight in 

 these animals, which is therefore less, by about one-twentieth, than the aver- 

 age in the Stallion. The increased size of the Cerebellum in Gt-ldinirs may 

 perhaps be accounted for, by remembering that this class of horses is solely 

 employed for its muscular power, and that the constant exercise of the organ 

 is not unlikely to develop its size; whilst Stallions, being kept especially 

 for the purpose of propagation, are much less applied to occupations which 

 call forth their motor activity. 



554. It is asserted, however, by the followers of Gall, that very strong 

 evidence of the truth of this doctrine is afforded by Pathological phenom- 

 ena : excitement of the genital organs, manifesting itself in priapism, tur- 

 gesccnce of the testes, and seminal emissions, being an ordinary concomitant 

 of some forms of apoplexy in which the Cerebellum is affected ; whilst in 



