110 

 ROYAL SOCIETY. 



DECEMBER, 1864. 

 In order that the transactions of the Eoyal Society should 

 present as complete a narrative as possible of the various 

 attempts to introduce Salmon into the colony, the Council 

 deem it advisable to print the following paper, which was 

 read by Mr. M. AUport, on 5th August, 1862 :— 



The apparatus in which the Salmon Ova were deposited 

 was placed between decks and was of two kinds — one hung 

 on gimbals in the same manner as a mariner's compass, the 

 other suspended on the principle of an ordinary swinging 

 tray. Both were of wood, — the gimbal apparatus consisted 

 of three shallow square boxes, one resting on the other, that 

 on the top being the smallest and was fitted with trays, the 

 bottoms of which were formed of parallel glass rods upon 

 which the Ova were placed. The suspended apparatus 

 consisted of a pyramid formed by three shallow square boxes 

 placed one above the other in such a manner as to leave 

 spaces between them, the lowest being four feet square, the 

 bottoms of the trays in this being formed of perforated pure 

 tin, on which rested one inch of gravel and in and upon the 

 gravel the Ova were deposited. The suspended apparatus was 

 varnished under the superintendence of Professor Pepper, 

 Chemical Lecturer at the Polytechnic, the other by the 

 Carpenter with common shell-lac varnish. 



The water was admitted at the top of each apparatus and 

 flowed from one tray to the other in such a manner that it 

 entered at the bottom of one, gradually filled it, passed over 

 the top to the next and out of the bottom of the second into 

 a third, and so on, the object being that a stream of water 

 might pass not only over the Spawn but under the glass rods 

 in the one case, and through the gravel in the other ; after 

 passing out of the lowest trays the water flowed into receiving 

 tanks and was again pumped up for use. 



Two kinds of water tanks were used — one of wood lined 

 with pure tin, the other of iron. For the purpose of cooling 

 the water, 25 tons of Wenham Lake ice were packed in an 

 ice-house, lined with lead, between decks. Above the ice- 

 house, and partly on deck, was a wooden tank, lined with tin. 

 This tank, like the ice-house, consisted of a double fi-amework 

 of timber filled in with charcoal. From this deck tank a pipe 

 passed into and through the ice-house, thence into an iron 

 tank, the top of which came through the bottom of the ice- 

 house, and from the last-mentioned tank another pipe led to 

 each apparatus. 



The Ova placed in the trays (50,000 in number) was of 

 various ages, the last having been taken from the parent fish 

 on the 22nd of February, 14 days before the vessel sailed. In 

 the ice-house a deal box was embedded (at the suggestion of a 



