It is indisputable that the artificial Tiiethod of hatching is 

 niore economical than that v^hicb-hcs rccoiorse to the segregation of 

 egged females. Besides, under thfe ordinary conditions where the 

 mr.rine fisheries are carried on, it is practically impossible to 

 reckon that the fishermen ret'orn to the sea berried fer/jales vdiich 

 shall be caught by their gear. However, they are bound, at NeiT- 

 foundland and Canada, by demand fVom industry to furnish to the 

 fish culturists the eggs which are carried under the berried 

 female's abdomen* 



In the United States attempts have also been mride on the arti- 

 ficial propagation ofthe lobster. ''He are not acquainted in a 

 fashion nearly complete with the results obtained by the U.S.Fish. 

 Commissions but on the other ho.nd vie have very precise data on the 

 works of the same species carried on by the Newfoundland and 

 Canadian governments c 



Originallyj at Newfoundland, artificial lobster propagation 

 used methods analogous to those of fish culture, properly speak- 

 ing. The lobster eggs, rubbed from the berried females \vhich v/ere 

 captured by the fishermen v/cre placed in jcxs v;here a current of 

 pure water circulated continuously. But,- since 1893, this method 

 has ceased to be employed'by Dr, Hielsen'o All the developing eggs 

 rubbed off from the females are actually placed in a special incu- 

 bator, invented by this scientist^ and which, floating at the svu*- 

 'face of the waters in the chosen localities, permit a considerable 

 n'umber of fry to develops .: ■ ,. . 



Nielsen's floating incubator i's 'composed of a box of \ihxte 

 ' wood, oblong, 1 meter 25 long, ;m 30 across and m 20 deep. The 

 bottom is curved. The box is provided v;ith, on the outside, on 

 each lateral face, tv/o fins, not absolutely horizontal, but slightly 

 curved like a propeller; they 'are also of viiite wood. In yielding 

 to "the sea ca.ught by the incubators, the ailerons facilitate, by 

 tieaue of the vraves^ the manner in -which they are rocked in a con- 

 tinual fashions A cJord, fixed to the bottom of the exterior, and 

 tied on the other end to a heavy rock, periaits the apparatus to be 

 easily maintained in the region determined for the coast. A rubber 

 vulcanized tube of m 23 long allow the sea vrnter to communicate 

 with the interior of the box. In the corners the uprights are 

 traveled over from top to bottom by a narrov-j- canal which assures 

 air circulation. 



"A metal cloth (galvanized steel), fine meshed, is stretched 

 horizontally c few centimeters above the bottojie It holds the 

 eggs which deposited there, after fertilization, are going to give 

 birth to the lobsters. In one ofthe small sides of the box, at the 

 extreme left, a rectangular light 'is hung with a fine metal cloth. 



"The incubator is closed by a cover, like a coffin, and all is 

 painted black. 



156 



