[Illustration: PLATE 38. W. N. P., & E. M. B. del. ad nat. THE CAMBRIDGE SCIENTIFIC INSTRUMENT COMPANY.] [Illustration: PLATE 39. F. M. B., W. N. P. & M. P. P. DEL. AD NAT. THE CAMBRIDGE SCIENTIFIC INSTRUMENT COMPANY.] [Illustration: PLATE 40. W. N. P. & A. C. H. DEL AD NAT. THE CAMBRIDGE SCIENTIFIC INSTRUMENT COMPANY.] [Illustration: PLATE 41. F. M. B. & W. N. P. del. ad nat. THE CAMBRIDGE SCIENTIFIC INSTRUMENT COMPANY.] [Illustration: PLATE 42. W. N. P. & M P P. del. ad nat. THE CAMBRIDGE SCIENTIFIC INSTRUMENT COMPANY.] [Illustration: PLATE 43. F. DEIGHTON del. THE CAMBRIDGE SCIENTIFIC INSTRUMENT COMPANY.] [Illustration: PLATE 44. F. DEIGHTON del. THE CAMBRIDGE SCIENTIFIC INSTRUMENT COMPANY.] [Illustration: PLATE 45. F. DEIGHTON DEL. THE CAMBRIDGE SCIENTIFIC INSTRUMENT COMPANY.] [Illustration: PLATE 46. A. B. BALFOUR DEL. THE CAMBRIDGE SCIENTIFIC INSTRUMENT COMPANY.] [Illustration: PLATE 47. A. B. BALFOUR, DEL. THE CAMBRIDGE SCIENTIFIC INSTRUMENT COMPANY.] [Illustration: PLATE 48. A. B. BALFOUR DEL. THE CAMBRIDGE SCIENTIFIC INSTRUMENT COMPANY.] [Illustration: PLATE 49. M. P. PARKER DEL. THE CAMBRIDGE SCIENTIFIC INSTRUMENT COMPANY.] [Illustration: PLATE 50. M. P. PARKER del. THE CAMBRIDGE SCIENTIFIC INSTRUMENT COMPANY.] [Illustration: PLATE 51. A. B. BALFOUR & M. P. PARKER DEL. THE CAMBRIDGE SCIENTIFIC INSTRUMENT COMPANY.] [Illustration: PLATE 52. F. M. &. A. B. BALFOUR DEL. THE CAMBRIDGE SCIENTIFIC INSTRUMENT COMPANY.] [Illustration: PLATE 53. F. M. &. A. B. BALFOUR DEL. THE CAMBRIDGE SCIENTIFIC INSTRUMENT COMPANY.] TRANSCRIBER'S NOTES: Underscores surround text in italics, _like this_. Raised dots in numbers were converted to decimals. Superscript letters are enclosed in braces, e.g. P{1}. Use of periods and commas in the abbreviations within and referring to illustrations is inconsistent. Often punctuation marks do not match the illustrations to which they refer. Periods were retained; commas were added to separate figure numbers from abbreviations within the figure. Spacing within the abbreviations was standardized. Occasionally, identification marks referenced in the text do not match the illustration (for example, discussion of Figure 10, Plate 2, where epiblast is identified with _e_ in the text, but with E in the illustration). Footnotes were renumbered sequentially, indented, and moved to follow the paragraph or section in which the anchor occurs. Other changes: Footnote 4: 're-agent' to 'reagent' Explanation of Plates, Plate 35, Figures 26-27: 'Tranverse' to 'Transverse' End of the Project Gutenberg EBook of The Works of Francis Maitland Balfour, Volume IV (of 4), by Francis Maitland Balfour