. 185 
and Professor STOKES gave the same explanation, pointing out 
that a bell was rarely a mathematical figure of revolution. 
Mr Porvrer attributed these beats to the occurrence of 
nodal lines on bodies when sounding, which gave rise to inter- 
ferences. 
(2) On a case of Asymmetry in the Human Body. 
By Professor Humpury, F.R.S. 
The subject of this paper was a female in Addenbrooke’s 
Hospital, who was born with one side of the body on a larger 
scale than the other, the want of symmetry being complete 
throughout. For example, it amounted to 24 inches in length 
of arm, and had been carried on in the right mammary gland 
and right side of the face, and even in the tonsil and teeth, 
the teeth being in a plane a little lower than on the left— 
the right arm and right leg stronger than left in either case ; 
the person was in good health and well made, with not the 
slightest sign of paralysis. Prof. Humphry quoted a case 
mentioned by Broca, of a boy, aged 11, in whom asymmetry 
was very marked, so much so as to look as if he were made 
of halves of different persons put together. He also exhibited 
two models of a brain from Van der Kolk’s museum at Utrecht, 
where there was marked want of symmetry. In this case 
there had been paralysis of the opposite side of the body; 
here it would result from deficiency of growth. It would be 
interesting to know whether the right or left side of the brain 
in the present case were larger. 
A conversation took place concerning the symmetry of crys- 
tals, in which Professors Minter, Humpury, and CAYLEY 
joimed. Mr SeeLry asked whether temporary paralysis of the 
mother would account for the asymmetry exhibited by the 
subject of the paper; Dr Humpury doubted whether it would 
do so, 
