chap, in.] THE CRUISES OF THE 'PORCUPINE: 141 



meters constructed on this principle, which have been found to 

 answer perfectly. The method is described in a short paper 

 which will be read to the Society to-morrow. 



"Tor obtaining specimens of water from any depth to which 

 the dredging extends, the Committee have procured an instru- 

 ment constructed as to its leading features on the plan of that 

 described by Dr. Marcet in the Philosophical Transactions foi 

 1819, and used successfully in the earlier northern expeditions 



"Mr Gwyn Jeffreys is now out on the first Cruise of the 

 'Porcupine/ the vessel which the Admiralty have sent out for 

 the purpose, and is accompanied by Mr. W. L. Carpenter RSc 

 (son of Dr. Carpenter), who undertakes the general execution of 

 the physical and chemical part of the inquiry. A letter has 

 been received by the President from Mr. Jeffreys, who speaks 

 hiohly of the zeal and efficiency of Mr. Carpenter. The ther- 

 mometers protected according to Dr. Miller's plan, and the 

 instrument for obtaining specimens of water from great depths, 

 have been found to work satisfactorily in actual practice Mr 

 Siemens' instrument was not quite ready when the vessel started 

 on her first Cruise, and was not on board when the above letter 

 was written. The gas-analyses have been successfully carried 

 on, notwithstanding the motion of the vessel. From a letter 

 subsequently received from Mr. Carpenter, it appears that Mr. 

 Siemens' apparatus, so far as it has yet been tried, works m 

 perfect harmony with the thermometers protected according to 



Dr. Miller's plan." 



"June, 16, 1869." 



Kesolved-That the Report now read be received and entered 

 on the Minutes. 



