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Proceedings of the Royal Society 
become more or less perfectly obliterated, and it is evident that no 
simple sensation of red or green could be felt, but only a colour- 
sensation, which corresponds with the excitement of both of these 
layers, which is yellow. It may, therefore, be worth the attention 
of anatomists, skilled in working with the microscope, to ascertain 
if any decided reduction of the interval Gr to R takes place towards 
the margins of the normal retina, or has place in the central part 
in eyes that have shown, during life, the commonest form of de- 
fective vision of colour ; we should also expect a reduction of the 
interval Y to Gr, but to a less decided degree. In the case of an 
eye completely colour-blind, we should look for the coalescence of 
the three layers into one, unless the defect were accounted for by 
the absence or paralysis of two of the layers. 
The following motion by Mr Sang was considered : — 
1. Every Communication intended for the Society shall be sub- 
mitted to the Council, and passed by them as not containing anything 
objectionable, before being mentioned in the Billet. 
2. The Society shall not take up any matter which has not been 
announced in the Programme, except in cases of extreme urgency. 
The motion was not adopted, as the Society thought that 
Mr Sang’s views were already embraced in the printed regu- 
lations for the order of business. 
Monday, 2 d May 1870. 
DAVID MILNE HOME, Esq., Vice-President, in 
the Chair. 
The following Communications were read : — 
1. Remarks on the Theories of Capillary Action. By 
Edward Sang, Esq., F.R.S.E. 
That theory of capillary action, which seems to have satisfied 
the greater number of physicists, is founded on the assumption 
that the particles of a fluid are separated by distances immensely 
