1888.] Prof. Crum Brown on Canals of Internal Ear. 151 
normal position, and the gas jets at their minimum. When this 
rate changes, we have acceleration in the one or other sense, and 
this is indicated by the flaring up of the corresponding gas jet. 
The model illustrates merely one-third of the complete apparatus, 
as it shows the results of acceleration about one axis only, and in 
both senses about that axis. 
Perhaps, in making such a model, it would be better to work the 
stop-cocks by means of cranks from the wheels, and so diminish 
the friction of the axles on their bearings. However, in the model 
shown, this friction is so small that very moderate acceleration is 
well indicated. 
The apparatus was made, from Professor Crum Brown’s instruc- 
tions, by Mr Alexander Prazer, 7 Lothian Street, Edinburgh. 
2. On the Temperature and Currents in the Lochs of 
the West of Scotland, as affected by Winds, By 
John Murray, Esq. 
3. Note on the Influence of Pressure on the Solubility 
of Carbonate of Lime in Sea Water containing Free 
Carbonic Acid. By W. G-. Reid. Communicated hij 
John Mukrat, Esq. 
Analysis of the dredgings brought to the surface during the Y oyage 
of H.M.S. “Challenger,” has shown, that in deeper water as the depth 
increased, the quantity of carbonate of lime shells decreased,* and 
as the pressure is in direct proportion to the depth under water, 
it was surmised that some connection existed between the pressure 
and the disappearance of lime shells. To ascertain if there was 
any truth in this surmise, Mr Murray suggested the following 
experiments. The results are unfortunately incomplete j neverthe- 
less, Mr Murray thinks it advisable to publish them. 
During this investigation, I had the honour of working with Mr 
H. N. Dickson, who, with his hands full of more important work, 
* Murray, “On Coral Keefs,” Proc. Roy. Proc. Eclin., 1880, p, 509 ; and 
Narrative of the Cruise of the Challenger, p. 923. 
