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THE POPULAR SCIENCE MONTHLY. 



rapid growth, with finely transparent walls (Fig. 16). Each cell has a 

 large nucleus, which, while variable and varying, is quite constant in 

 position, and often shows one or more vacuoles. Out to the very lim- 

 its of the cell, sweeping its every corner from the nucleus as a center, 

 vital streams go forth streams now wide and sweeping, now narrow- 

 ing and again swelling, or pouring along to join some neighboring cur- 

 rent ; now forming temporary vacuoles, now bearing on strong tide 



Fig. 15. Base-Cells of a Tomato Haie. 



Fig. 16. Hair from Pumpkin Vine. 



particles large and small, granules of chlorophyl and what not ; now 

 branching in various directions, now diminishing to merest threads, 

 forming and fading away, finally disappearing below the field of vis- 

 ion, only to reappear once more at the place of starting. The changes 

 of movement and appearance are so rapid that no drawing can be true 

 for more than a single moment. 



In studies such as these we might pass on from plant to plant, in 

 garden, on highways, in forest and on prairie, until time should fail 

 and patience be well wearied. The " Song of Nature " is true : 



