# Microscopical Researches/Explanation of the Plates

EXPLANATION OF THE PLATES.
Where no other measurement is given, the figure represents the object magnified about 450 diameters, linear measurement.
PLATE I.
Fig. 1. Parenchymatous cellular tissue, with cell-nuclei from an onion, magnified 290 times.
2. Matrix of the pollen of Rhipsalis salicornoides.
3. Do. do.
I am indebted to the kindness of Dr. Schleiden for the last two delineations.
4. Cells from the chorda dorsalis of Cyprinus erythrophthalmus.
5. Cartilage from the point of a branchial ray, from the same.
6. Cartilage from the middle of a branchial ray, from the same.
7. Cartilage from the root of a branchial ray, from the same.
8. Branchial cartilage from the larva of Rana esculenta.
9. Cranial cartilage (ethmoid bone) from the larva of Pelobates fuscus.
10. Cells from the crystalline lens of a foetal pig four inches long.
11. An isolated nucleus of the cells of the crystalline lens.
12. Cells from the crystalline lens of the same foetus, exhibiting their prolongation into the fibres of the lens.
13. Fibres from the innermost layers of the lens of a pike.
PLATE II.
Fig. 1. Ovum of a goat, after Krause (Müller’s Archiv, 1837, Pl. I, fig. 5).
2. Cells from the yelk-cavity of a mature hen’s egg.
3. Cells from the interior of an egg measuring a line and a half in diameter, taken from the ovary of a hen.
4. Portion of the germinal membrane of a mature hen’s egg before incubation, viewed from above.
5. Portion of the germinal membrane from a hen’s egg after sixteen hours’ incubation. It is folded in such a manner that the external surface or serous layer forms the margin.
6. Cells from the serous layer of the same germinal membrane in the neighbourhood of the area pellucida, after separation of the mucous layer.
7. Cells from the mucous layer of the same germinal membrane on the outside of the area pellucida.
8 and 9. Pigment-cells of different kinds and stages of development, from the tail of the tadpole.
10. Cells from the interior of the shaft of a fully developed wing-feather of the raven.
11. Earlier stages of development of the same, from the portion of the shaft of an immature feather which has not as yet become hard.
12. Cell-nuclei, from the same, around which no cells have as yet formed.
PLATE III.
Fig. 1. From the point of a branchial cartilage of Rana esculenta. The lower margin of the delineation exhibits the natural border of the cartilage.
2. Cartilage from the ilium of a foetal pig five inches long, after the application of acetic acid.
3. Enamel fibres from immature teeth of a foetal pig.
4. Cells from the surface of the enamel membrane.
5. Fibres which compose the substantia propria of the human tooth, isolated by maceration for two days in dilute hydrochloric acid.
6. Fibre-cells from the areolar tissue lying beneath the superficial muscles of the neck of a foetal pig measuring seven inches.
7. A more fully developed cell of areolar tissue.
8. Cells from the gelatinous substance between the chorion and amnion of a foetal pig seven inches long.
9. Larger and very pale cells from the areolar tissue of the orbital cavity of the same foetus.
10. Fat-cells from the cranial cavity of the young of Cyprinus erythrophthalmus.
11. Fibre-cells from the tendo achillis of a foetal pig three and a half inches long.
12. From the middle coat of the aorta of a fetal pig measuring seven inches in length.
13. Cells from the interior of the quadratus lumborum muscle of a foetal pig three and a half inches long.
PLATE IV.
Fig. 1. Dorsal muscles of a foetal pig three and a half inches long.
2. The fibre c from the previous figure, after the application of acetic acid.
3. From the brachial muscles of a fetal pig seven inches long.
4. Primitive muscular fasciculus from the cockchafer.
5. Muscular fasciculus from a pike.
6. A portion of the ischiatic nerve of a foetal pig measuring four inches.
7. Fasciculus of nervous fibres from the brachial plexus of a foetal pig four inches in length.
8. Single nervous fibres: a, from the nervus trigeminus of a foetal pig measuring six inches and a half; b, c, d, from the nervus ischiadicus of the same.
9. Nervous fibre from the vagus of a calf.
10. Ganglion-globules from the lowest ganglia of the sympathetic of a frog.
11. Capillary vessels in the tail of the tadpole.