( 574 ) 
tis calculated, as if A had continued to occupy the position Aj 
one is led to an influence on the astronomical motions of the order 
ri if V were equal to the velocity of light, this influence would be 
much greater than observations permit us to suppose. If, on the contrary, 
the terms with = are to have admissible values, V ought to be many 
millions of times as great as the velocity of light. 
From the considerations in this paper, it appears that this con- 
clusion can be avoided. Changes of state in the aether, satisfying 
equations of the form (I), are propagated with the velocity V; yet, 
no quantities of the first order 2 or a (S 8), but only terms con- 
2 
taining 5 and = appear in the results. This is brought about 
by the peculiar way — determined by the equations — in which 
moving matter changes the state of the aether ; in the above mentioned 
case the condition of the aether will not be what it would have been, 
if the acting body were at rest in the position A). 
Physiology. — “On the power of resistance of the red blood cor- 
puscles”’. By Dr. H. J. HAMBURGER. 
(Will be published in the Proceedings of the next meeting.) 
Physics. — “On the critical isotherm and the densities of saturated 
vapour and liquid in the case of isopentane and carbonic 
acid”. By Dr. J. E. Verscnarreirt (Communicated by 
Prof. H. KAMERLINGH ONNES). 
(Will be published in the Proceedings of the next meeting). 
(April 25, 1900.) 
