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plate: with a chisel in order to remove some spots, he noticed 
that the passage of the instrument across the plate occasionally 
produced a powerful and distinct musical note, and that, when 
this happened, a long row of fine equidistant striations was 
left on its surface. These marks were closer together when 
the sound was acute than when it was grave. Having pro- 
duced by the above means two notes which differed by an 
exact Fifth, Galileo measured the distances between their re- 
spective strie, and found that three of those corresponding to 
the upper note occupied precisely the same space as two cor- 
responding to the lower. He hence inferred that the numbers 
of vibrations executed in the same time by any two notes 
forming this interval are in the ratio of 3:2; a conclusion 
which had previously been only conjectured from results ob- 
tained by the monochord. Galileo remarks further that the 
same principle applies to the case of any interval. 
Mr Taylor exhibited a brass plate with rows of strize upon 
it obtained by screwing the plate into a lathe, and, while it 
was rotating, holding the edge of a chisel against it in such 
a way as to produce a musical sound. The markings were 
in some cases extremely fine and regular. 
April 27, 1874. 
The PRESIDENT (PROFESSOR BABINGTON) in the Chair. 
Communications were made to the Society: 
(1) On the use of the “ Ligamentum Teres” of the hip- 
joint. By Mr Savory, F.RB.S. 
This paper discussed the proper use of the “ligamentum 
teres,” which, though variously stated, has not, it was main- 
tained, been correctly given. The statement that the liga- 
ment is vertical and tight, when the person is erect, has been 
