Experimenb 7 in our nev; cenent apparatus itcis bad; it appeared I 



that the ser. v<-ater dissolved the cenent so that the sand v;as stand- < 



ing out and had an effect like a sandpaper on the young. It tecane 1 

 very v'orn, especially the. rostral spine was exposed. The young xrere 

 for a time transferred to 'apparatus 3, the cement box v/as cleaned 

 and polished (r/ith "shellac"-solution)o The. .young v:ere taken back 

 again and nov/ "appeared to tlririve better. As it had already suffered 



a good deal, hov/ever, all of them, \rere liberated in the sea Auf;ust i 



3, The apparatus vrv.s cleaned and polished v;ith cellulose polish* , 



A neviT experiment was started August 6, as the young lobsters were ] 



already gathered in the other apparatus. The apparatus now funct- i 



ioned excellently; 29 per cent were released in the 4th stage by ' 



the tine the work had to be discontinuedc ' 



With regard to the capacity of the apparatus it rdght be men- 

 tioned that apparatus 1 and apx^aratus 2 each have' two rooms ivith an j 



effective cubic capacity of". 500 cu.decineters j 



Apparatus 3 also two rooms 1,000 " " ; 



Apparatus 4, one effective room at e •*...• • 3,350 " " ' 



You will see that the experiments have p;iven between tv;o and 

 seven young lobsters in the bottom stage per liter cubic capacity - 

 a result vrhich must be regarded satisfactory... 



The troublesome infect or fl-om last year's experiments appeared 

 also th'is year; but in a normal nijj.iber and v/ithout having the least 

 harmful effect on the young. The vfater reser'/oir had been cleaned 

 the preceding v.dnter, and had also been empty during a period of 

 fJrost. 



The temperature conditions were favorable at the beginning of 

 the season, abdut 16-17 degrees (C«), but saiilc dui-ini; the days July 

 25-27 below 14 degrees; at such a temperature the development pro- 

 ceeds very slowly* Later on it increased again and stayed generrlly 

 between 16 and 18 degrees Ce 



The total result of the vj-ork of the summer is as follows: 



Pvirchased, in all 



Gathered from these 



Let out_ due to lack of space 



Preserved as ne\Tly hatched 



Left for rearing 



Thereof released 



Kept and for further rearing 



Liberated in other stages 



Preserved in other stages 



62 



