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race. It would be very interesting to observe whether the 
Quadrumana shewed any preference in the use of the right 
hand. He had observed the smaller monkeys, and concluded 
that they seized and wrought indifferently with either hand, but 
the larger anthropoid apes he had not observed. 
November 15, 1875. 
PROFESSOR BABINGTON, VICE-PRESIDENT, in the Chair. 
The following communications were made to the Society: 
(1) On the behaviour of Nucleus during Segmentation. 
By ¥. M. Baxrour. 
The following observations were made upon the eggs of 
Scyllium and Pristiurus. Ata late stage of the segmentation 
of these eggs most of the segments contain nuclei, but in some 
of them there is to be seen in the place of the nucleus a 
peculiar body. This has the shape of two cones with their 
bases in apposition. In each cone a series of strize radiate from 
the apex to the base; and between the two is an irregular row 
of granules. From the apex of the cone there further diverge 
into the protoplasm of the cell a series of lines. The author 
regards these peculiar bodies as metamorphosed nuclei in the 
act of dividing. He points out that the simple division of the 
nucleus, as well as its complete disappearance, accompanied by 
the formation of two fresh nuclei, are well-authenticated modes 
of behaviour of the nucleus during cell-division. These two 
processes can only be connected on the supposition that in the 
second case the two fresh nuclei are formed from the matter of 
the old nucleus. The author considers that there exist in 
Selachians modes of behaviour of the nucleus intermediate 
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