448 Holm. — Bartonia, Muehl . Anatomical Study. 
EXPLANATION OF FIGURES IN PLATES XXXIII 
AND XXXIV. 
Illustrating Mr. Holm’s paper on Bartonia. 
(The letters in the figures indicate as follows : Ep ., epidermis ; End., endodermis ; L., leptome ; 
X*., inner leptome ; H., hadrome ; M., mestome-parenchyma ; P ., pith.) 
PLATE XXXIII. 
Fig. i. Three specimens of Bartonia verna ; natural size. 
Fig. 2. Same species ; corolla laid open, x 2. 
Fig. 3. Same species ; a stamen, x 6. 
Fig. 4. Same species ; the capsule, x 6. 
Fig. 5. A small specimen of B. lanceolata ; natural size. 
Fig. 6. Same species ; inflorescence of a larger specimen ; natural size. 
Fig. 7. Same species ; corolla laid open, x 6. 
Fig. 8. Same species; a stamen, x 18. 
Fig. 9. Same species ; a flower, x 4. 
Fig. 10. Same species ; two capsules, closed and opened, x 6. 
Fig. 11. B. verna ; cross-section of part of stem, x 360. 
Fig. 12. Same species; cross-section of part of stem, x 480. 
Fig. 13. Same species ; cross-section of part of stem, showing a very small collateral mestome- 
bundle. x 480. 
Fig. 14. B. lanceolata ; cross-section of peduncle, showing a stoma, x 480. 
Fig. 1 5. Same species ; cross-section of peduncle, x 600. 
Fig. 16. Same species ; cross-section of leaf, x 480. 
Fig. 17. B. tenella ; a flower, x 4. 
Fig. 18. Same species ; corolla laid open ; anthers have dropped, x 5. 
Fig. 19. Same species ; capsule, x 5. 
PLATE XXXIV. 
Fig. 20. B. verna ; cross-section of stem, x 480. 
Fig. 21. B. lanceolata', stoma from the stem. x 360. 
Fig. 22. Same species; cross-section of basal internode of stem, x 480. 
Fig. 23. B. verna ; stomata from the stem, x 360. 
Fig. 24. Same species ; cross-section of one of the higher internodes from about the middle of 
the stem, x 480. 
