The following conclusions could be drawn from germination tests with Spartina seeds and from some culture experiments with this grass: 1. Seeds of Spartina Townsendii germinate the faster the lower the NaCl content of the medium. As the seeds are approaching full maturity the influence exercized by NaCl on the time that is necessary for germination, diminishes (Table I and II). 2. The seeds lose their capacity for germinating when they desiccate. Kept in seawater, at low temperatures, they retain their germinating capacity for a long time (Table HI and IV). When a large stock of seeds is required for experiments they can best be stored in a large heap in a cold and moist environment. 3. During storage a distinct after-ripening process occurs in Spartina seeds. They germinated the faster the later in the storage period the germination trials were started (Table V and VI). 4. Results of culture experiments in pots containing loam soils show that a salt content of 0.5-1.0 % NaCl in the added nutrient solution (Keller, 1925) is necessary for optimal growth (Table IX and X). In water cultures the plants grew best when no NaCl was added. It is not impossible, however, that in the latter case the nutrient solution (van Eyk) was not sufficiently balanced (Table VII and VIII.