JOURNAL OF MICROSCOPICAL SCIENCE. 



DESCRIPTION OF PLATE I, 



Illustrating Mr. Rainey's paper on the Formation of the 

 Starch-granule. 



Fig. 

 1. — Ordinary forms of starch. 

 2, 3. — Starch-granules ; two joined together, producing an appearance 



considered to be the result of cell-multiplication by division. 

 4. — Three starch-granules similarly united. 



5. — Three granules thus united, as seen by polarized light, from Cruger. 

 6, 7. — Starch-granules, called by author " compound granules." 

 8. — Two globules of carbonate of lime, joined together and coalescing into 



one ; from calcifying shell of oyster. 

 9. — Large artificial calculi of carbonate of lime in progress of coalescence. 



PLA.TE I {continued), 



Illustratiug Dr. C. Johnston's paper on Diatomacese, 

 chiefly from Elide. 



10. — Asteromphalus centraster, C. J. 



a. Portion of the same, more highly magnified. 

 11. — Campylodiscus marginalis, C. J. 

 12. — Cocconeis regina, C. J. 

 13. — Achnanthes anc/ustata, C. J. 

 14. — „ costatus, C. J. 



a. Upper valve, b. Lower valve, side view. /. Front view of frustule. 



