CYTOPLASMIC INCLUSIONS OF THE GERM-CELLS. 407 
The Cytoplasmic Inclusions of the Germ-Cells. 
PART I. LEPIDOPTERA. 
By 
J. IS ro site Gtitenby, IS. A., 
Exhibitioner of Jesus College, Oxford. 
With Plates 23, 24, and 25 and 5 Text-figures. 
Table of Contents. 
PAGE 
1. Introduction • 408 
2. Previous Work . . . 409 
3. Technique and Material . 412 
4. Nomenclature .... 414 
5. Mitochondria (Male) . . .418 
6. Comparison of Mitochondria of Several Species 421 
7. Changes undergone by Mitochondria in Spermatocyte 423 
8. Mitochondria in Spermatocyte Division . 424 
9. Formation of Macromitosome (Nebenkern) . 425 
10. Subsequent Fate of Macromitosome . . 429 
11. The Micromitosome 430 
12. Cell Processes of the Spermatocyte . 434 
13. The Spindle Bridge ..... 435 
14. The Probable Function of the Spindle Bridge . 436 
15. The Precociously Formed Flagella . 436 
16. Acroblasts and Acrosome .... 438 
17. The Mitochondria of the Female . 442 
18. Other Cytoplasmic Bodies .... 446 
19. Abnormalities ..... 446 
20. The Fixing Reactions of the Cell Inclusions . 449 
21. The Probable Nature of the Micromitosome . . 450 
22. Discussion ..... 450 
23. Summary ..... 457 
