fore be considered as proved that some yoxong lobsters really grew 

 up in the park. But at all events their number has been very small 

 in comparison vj-ith the quantity of hatched 'rood, and it is no 

 proof as to the practical use of hatching and rearing of lobsters in 

 a closed park. 



Ifith regard to the question v/here the brood disappears, I have 

 no doubt that the greater part of the young already in the first stage 

 is led by the c\xrrent out througti smaller openings in the v/alls. 

 OthervTisc ive ViTould have caught lobsters in later stages during our 

 experiments in the folloi'/ing years. I think that these experiments 

 have proved that rearing of lobster in parks, at least when t.h^y are 

 built according to the principle used in the Kvitings/ park, is 

 impossible. The purpose of such a rea.ring is to protect the brood 

 from the dangers of a different kind to which they are exposed in 

 natiAre, but one of the conditions for the rearing is of course that 

 the young really go through the development in the park. 



On account of the experiences made '^n the above mentioned park, 

 we cannot take into consideration rearing in closed basins if our 

 purpose is to increase the lobster population by rearing of the 

 larvae to the bottom stage. But such basins are excellent , v/hep it 

 comes to make investi'';ations concerning the adult lobsters* biology. 

 In this respect the park at Kvitings/ has been of great help to me 

 and without it I vrould not hr^ve been able to solve several important 

 Questions. 



For several years I have made my rearing experiments by means 

 of boxes Tfhich float near the surface of the sea. As this method 

 has given better results, I shall 'give a more detailed description 

 of the same, although the percentage . of reared individuals has not 

 been satisfactory here either. 



The material used for the rearing boxes must be strong and 

 cheap. This is specially important v^ith regard to the net of which 

 the sides and the bottom of the boxes are made. At the begirjiing . 

 I used net made of horse, hair, but this was too expensive. Lately 

 I have used a certain kind of thread-net, so-called iron-tl-iread-net , 

 with as large meslies as possible. This is cheap -- and very strong, 

 stronger than the horse hair not. It is also easy to keep clean. 



The wooden part of the box consists of a somevrhat wide frame on 

 the "top; below and on the sides of quite narroiv wooden boards. I 

 refcjr to tht' enclosed picture of such a box (fig. l). The size is 

 as follavjs : 



16 



