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Deéfinition'of:sponge cultures o-< == 8 ao ee ee ee ee ee 589 
Generalicousiderdtions: “Secs = soe Ss Se ee Se eee ee eee 590 
Calture of'sponges by\planting 2-*= 9a" 1. See See eae eee ee eee 594 
Nponce eniltite by patcare.£ 223 is ek ee ee a eee 598 
Sponreiculture by means of-eollectors for larvae = es ee ee 599 
Spanvelenlture by meansof cuttines=c2 oacee sre. eh as eee en ee eee eee 604 
Conclusion 225 252. A Ss ee se ae ee Se Se ae ee ee ee a ee 613 
Bibliography= <= o2s25--22¢ 2S. 3 eases se ae See acetate es secs e aes eee p eee eee 613 
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588 
