XVI. NATUBE'S JEWELS. 



" I hold it of little matter 



Whether your jewel be of pure water, 



A rose-diainond or a white, 



But whether it dazzle me with light." 



Tell them, dear, that if eyes were made for seeing, 

 Then Beauty is its own excuse for being." EMERSON. 



A GLASS slide, on which are mounted a number 

 of Diatoms, carefully selected and artistically ar- 

 ranged, suggests the heading of this vignette. To 

 the naked eye, the whole group appears as but the 

 faintest speck on the glass. Only a relatively low 

 power enables us to see them all at one glance 

 under the microscope but this view is enough to 

 evoke the joyful acclamation, "Gems! Jewels! 

 Who would have thought it ? " We increase the 

 magnifying power, and now we can see only one 

 at a time, but by shifting the stage we bring them 

 one after another under observation ; and now a 



