_Fig. 2._--A globus with a vacuole in which are fragments stained with Bismarck brown, probably the remains of nuclei. _Fig. 3._--A globus lying in a cell; the nucleus and a part of the cell-protoplasm preserved. _Fig. 4._--An epithelial cell from a seminal canal, filled with bacilli broken down into granules. _Fig. 5._--Cross section of a blood-vessel with bacilli in the endothelium and a white blood corpuscle filled with bacilli. _Fig. 6._--Longitudinal section of a blood-vessel showing bacilli in the endothelium, and a fibrinous coagulum enclosing two white blood corpuscles, one of them filled with bacilli. _Fig. 7._--Bacilli free between the red blood corpuscles. _Fig. 8._--A connective tissue space from the tunica albuginea filled with bacilli. _Fig. 9._--Cross section of a blood-vessel with bacilli around the nuclei of the surrounding connective tissue. All the preparations from the testicle were hardened in Fleming’s or Müller’s solutions, and the drawings made with a Seibert homog. immersion lens 1/16. _Plate IX_, _Fig. 5_ with Seibert 1/8. [Illustration: PLATE X.] PLATE XI. _PLATE XI._ _Fig. 1._--Bundle of nerve fibres from a ciliary nerve, the cells of Schwann’s sheath filled with brown granules. _Fig. 2._--The myelin sheath pressed in by a cell filled with granules. _Fig. 3._--Section from an old leprous macule. _Fig. 4._--Section from a recent leprous macule. Both sections stained with Fuchsin and Methyl-green. Seibert homogen. immersion 1/16. [Illustration: PLATE XI.] PLATE XII. _PLATE XII._ _Fig. 1._--Cross section of a leprous ulnar nerve. The darkly hatched cells represent those filled with brown granules. It will be noted that the axial cylinder is wanting in many of the nerve fibres (Hartnack, No. ix). _Fig. 2._--A piece of neurilemma with flat connective tissue cells lying on it, containing brown granules darkened by osmic acid (Gundlach, No. viii). [Illustration: PLATE XII.] PLATE XIII. _PLATE XIII._ _Fig. 1._--Cross section of an atrophic muscle, growth of nuclei in the perimysium. Low power. _Fig. 2._--Cross section of an atrophic muscle with great development of connective tissue. Low power. _Fig. 3._--Proliferation of the nuclei of the perimysium. High power. [Illustration: PLATE XIII.] TRANSCRIBER’S NOTE- 1. Enclosed italics font in _underscores_. 2. Hyphenation has been standardized. 2. _TABLE I._: Abbreviations have been used as shown in the Key. Longer entries have been replaced by indexes to Footnotes, which are listed at the foot of the Table.