not mcike ciny cnlculcitions as to how many percent^Trere hatched; it was 

 however, - by means of direct examinations of the quality of the eggs 

 and of the contents of the bag - possible to find out that the hatch- 

 _ing was completely successful for this method. All spa'vta 'remr.ined 

 fresh and vras put into quick circulation by the current. Here I 

 fou^d none of the hatched, but "undeveloped" brood which \Tere foimd 

 in such a large quantity in the floating boxes, v/here the loosened 

 spaTm develops without any motion. '-'r. 



I let the hatched larvae stay in the bag H v^ithout' giving them 

 any food. They had to li\:e on what food they could find in the bag, 

 i.e., partly by cannibalism, partly on the eggs vdiich had not yet 

 been hatched. I saw that they ate much of the last mentioned food. 

 It was interesting to find that all the larvae in this bag were 

 generally bigger and stronger than in the other bags, where the 

 yoiing only got food from time to time. It seens, therefore, that we 

 can produce stronger larvae by keeping food available at all hours* 



During the time we made the rearing experiments, the temperatxare 

 of the v/nter vms rather high and-- steady. (The footanote p. 125 gives 

 the tonpratiu*es in the rearing bags during the time July 13 to 

 August 8.) Partly this fact, partly the better hygienic conditions, 

 created by the motion, probably caused a quicker development than I 

 have observed in my earlier experiments. It seemed that the 4th stage 

 was reached generally a v/eek earlier than by my preceding experiments, 

 where I mentioned that the time necessary for reaching the 4th stage 

 T/as 28-29 days (p. 58). Further experiments and measurem.ents of the 

 temperature v/ill give more certain informant ion as to this question. 



In spite of the fact that these first rearing experiments can- 

 not be regarded as proof that rearing to the bottom stage can bo 

 made successfully on our -coast under all conditions, they might be 

 considered rather promising; they positively indicate progress, so 

 that we. might hope that they will be profitable, both practically 

 and economically, also for o\xr country, when the relatively unir^ort- 

 ant technical difficulties ha-oje been removed. The method \iv.s first 

 introduced at YJickford, R. I., where it is now used on a large scale; 

 hov.'over, they did not reach any better results there during the 

 first years, than we attained last sum:aer at Kvitings/. (A report 

 "by- Dr. Head for 1902 shovra that the results at Yfickford varied from 

 16 to 50> - the last figure, however, refers only to one single case, 

 but later the results have become better all the time, as far as xre 

 can see from the reports (Barnes, p. 123). 



The relatively high percentage attained at Kvitings/ with this 

 method, even under unsatisfactory- technical c-^nditions, indicates that 

 vre night expect better results under completely satisfactory^ technical 

 conditions. I have therefore based mjr judgment as to the effective- 

 ness of the different methods on these assumptions, which I thir± I an 

 Justified in malcing after, the mt\ny years I have studied the questions 

 in connection with rearing of lobster. 



(p. 126) 

 22 



