CHAP. III] 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. 
“For 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 for 
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, B.Sc. 
(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 
highly 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 in 
perfect harmony with the thermometers protected according to 
Dr. Miller’s plan. 
** June 16, 1869.” 
Resolved,—That the Report now read be received and entered 
on the Minutes, 
