JOURNAL OF MICROSCOPICAL SCIENCE. 



EXPLANATION OF PLATE X, 



lUustratiDg Mr. D. Scott^s Paper on '' The Development 

 of Articulated Laticiferous Vessels.^^ 



Explanatioti of the Figures. 



Fig. 1. — Tragopogoii eriospermus. Diagrammaiic cross-section of the 

 bypocotyl. 



h. I. V. Hypodermal laticiferous vessels, pk. I. v. Laticiferous 

 vessels of the phloem, pk. Phloem part of libro-vascular bundle. 

 3-j/. Xylem part of ditto. 



Fig. 2. — Tragopogon. Part of cross-section near base of cotyledons in 

 dry seed. 



L V. Cells which form the hypodermal laticiferous vessels. 



Fig. 3. — The same in longitudinal section, showing difference in the cell- 

 contents. 

 I. V. As before. 



Fig. i. — Similar section from seed tweuty-four hours after sowing. 



Fig. 5. — Latex-vessels from the cotyledons of seedling, with root 1 cm. 

 long. Absorption of cross-walls in progress. 



Fig. 6. — Scorzonera hispanica. Diagrammatic cross-section of hypocotyl. 

 /. V. Laticiferous vessels, ph. Phloem, xy. Xylem. 



Fig. 7. — Corresponding diagram of cotyledonary sheath. 

 Letters as before. 



Fig. 8. — Scorzonera. Latex-vessels from base of young leaf, showing 

 anastomosis and indications of the constituent cells. 



Fig. 9.— Part of a latex-vessel from root of Chelidonium majus, showing 

 thickened ridge. 



