50 Scientific Intelligence. 
stood in a room sixteen feet from the instrument, and again at 
seventeen feet, the difference of pressure was dis stinetly shown by 
the pendulum. An alteration of the plumb line through 7}>5 of 
a second of are was easily measurable. The experiments of the 
authors confirm the previous results of M. d’Abbadiela and also 
of M. Plantamour, who found that there were ths iods of agita- 
s surface without reference to 
any perceptible external cause, and that there were gradual 
changes of level extending over several months, and indications 
of an annual inequality of level. In short the earth’s surface ap- 
pears to be in a state of continual movement. Previous experi- 
; nae 
deep mine if a support sufficiently invariable could be found there. 
foe ort oe Seueen of the British Association, Ses of 
Sir W. Thomson, Professor t, Professor 
Sue Dr Sanory Professor Purser, Professor G. Parise and 
race Darwin, appointed oe the measurement of the a 
Disturbance of Grav vity. Account of experiments b H.° 
Darwin and H. Darwin; read re York, September, Is Da 
on the surface of Water. Lua “of 
water are frequently seen een for some time on the surface of 
water before they disappear. henomenon is frequently seen 
feat ng showers, and we hh e prow of a boat which is throwing up 
The results of ecpaiee ets by Professor Dikothe ee iit 
appear to affect the phenomena. meconaiio fs ri Phil. ee 
ee Oct. 4, ivdeigiain- oF Nov. 3 
and wave lengths is examined pr st entally.—Annalen der 
Physik und Chemie, No. 10, 1881, p. 177. ee 
