JOURNAL OF MICROSCOPICAL SCIENCE. 



DESCRIPTION OF PLATE XIV, 

 Figs. 1—4, 



Illustrating Prof. Thiseltoii Dyer's Note on the Imbed- 

 ding of Crystals in the Walls of Plant-cells. 



(After Pfitzer.) 



Fig. 



1. — Section throush the upper epidermis and the underlying layers of cells 

 from a youug leaf of Citrus vulgaris, Risso. X 400. 



2. — A similar section through an adult leaf, x 400. 



3. — Section through an old crystal -bearing cell from Citrus vulgaris, Hisso, 

 showing the cavity left after the crystal has been dissolved by hydro- 

 chloric acid. X 400. 



4. — Crystal-bearing cells adjoining bast bundles of Populus italica, Mnch., 

 macerated, and the crystals dissolved out by hydrochloric acid. X 400. 



