102 Fresh Water Aquarium 



perus alternifolius can be used for aqua- 

 riums of medium size. 



The true Papyrus, Cy perus papyrus, the 

 plant that furnished the material for the 

 Papyrus rolls of the old Egyptians, is highly 

 decorative, but to grow well, it requires large 

 vessels, and thus is hardly adapted for use 

 in the aquarium of ordinary size. 



Water-feather {MyriophyUum proserpina- 

 coidcs). This Thousand-leaf is a South 

 American species, in shape not unlike the 

 other MyriophyUum enumerated under sub- 

 merged plants. The leaves surround the 

 stem in whorls of from three to five. They 

 are divided into fine filaments arranged in 

 comb shape on both sides of the middle rib. 

 This plant, while not suitable for the small 

 aquarium, will be found valuable for larger 

 vessels, where it can be planted so that it can 

 grow above the surface of the water. Here 

 it will develop very rapidly the long slender 

 stems with their light, almost yellowish fo- 

 liage. Sometimes and under a strong light 



