742 



THE HAEVEIAN ORATIOI^. 



the character of a cylindrical band for a lesser distance, but with no 

 less distinctness as a column, than in the Ungulata. Such a case I 

 had actually before me whilst writing this, and you have it now 

 figured before yon (Fig. 4)^ 



Fig. 4. — Human Heart. The right ventricle has its cavity exposed. The 

 moderator band M is seen to pass up from the base of a musculus papillaris 

 arising from the outer or movable wall of the ventricle into the neighbour- 

 hood of the conus arteriosus. Close to this, its upper end, a chorda tendinea 

 arises by two roots, and passes up to the most posteriorly placed of the three 

 cusps of the tricuspid valve. 



* Since this oration was delivered I have received two communications relating 

 to the presence of a moderator band in the human heart. One of these, from my 

 former pupil, J. C. Galton, Esq., F.L.S., was accompanied by a sketch in which a 

 moderator band was drawn as passing in a human heart from the insertion into the 

 movable wall of the ventricle and the very constant musculus papillaris supplying 



