SUPPLEMENT. H 



the meantime by Professor Agassiz and Commander Bartlett. 1 quote 

 from the Bulletin again, this time giving Professor Agassiz's words: 



"On the 1st of July the Sigsbee. cylinder was tried for the second 

 time in Lat. 39° 59' 16" N., Long. 70° 18' 30" W., in 260 fathoms of water. 

 The surface was carefully explored with the tow-net to see what pelagic 

 animals and others might be found on the surface. There were found 

 Galanus, Sagitta, Annelid larva?, Hydrokl Medusa 3 , Squilla? embryos, 

 Salpae, and a few Radiolarians. The cylinder, filled with water which 

 had been carefully sifted through fine muslin, was then attached to the 

 dredging-wire, and lowered, so as to collect the animals to be found 

 between 5 and 50 fathoms. The time occupied by the cylinder in passing 

 through that space was 28 seconds. The cylinder was then brought up. 

 and the sieves and gauze trap carefully washed with water, which had 

 also previously been strained through fine muslin. The water was care- 

 fully examined, and we found the very same things which had a short 

 time before been collected at the surface with the tow-net and the scoop- 

 net; nothing different was collected by the cylinder. The Radiolarians 

 (two genera) were perhaps more numerous than at the surface. A slight 

 breeze having sprung up after the surface collections had been examined, 

 the cylinder was then sent down a second time at this same station, so 

 adjusted as to collect any animal life to be found from a depth of 50 to 

 100 fathoms. Not only in this experiment, but in all the subsequent ones, 

 the same precautions were taken in regard to straining the water which 

 filled the cylinder at the start, as well as that used for washing out the 

 sieve and the gauze trap. The messenger sent down to detach and open 

 the machine occupied 21 seconds in reaching the (50 fathoms) point to 

 which the cylinder was attached, and the cylinder then occupied 30 

 seconds in passing to the stop at 100 fathoms. On examining the sieves, 

 it was found that the more common surface things, Calanus, Sagitta, 

 Annelid larva?, Hydroid Medusa?, and Squilla? embryos, were entirely 

 wanting, and there were only two Radiolarians of the same species as 

 those from the upper levels found after a careful scrutiny of the water. 

 Nothing additional was brought up. The cylinder was then sent down a 

 third time, lowered to a depth of 100 fathoms, the messenger sent down 



