470 
GEOFFREY SMITH AND EDGAR SCHUSTER. 
10. Nussbaum, M. — ‘ Pfliiger’s Arcliiv. f. Pliysiologie,' Bd. cxxvi, p. 519, 
1909. 
11. Stockard, C. R. — ‘Arcli. f. Entw. Mecli.,’ vol. xxxii, p. 298, 1911. 
12. Guthrie, C. G. — ‘ Journal of Exp. Medicine.,’ vol. xii, p. 269, 1911. 
13. Meisenheimer, J. — ‘ Zoologisclier Anzeiger,' Bd. xxxviii, p. 53, 1911. 
14. Kopec, S. — ‘Arcliiv f. Entw. Mecli.,* Bd. xxxiii, p. 1, 1911. 
EXPLANATION OP PLATES 43-40, 
Illustrating the paper by Mr. Geoffrey Smith and Mr. Edgar 
Schuster on “ Studies in the Experimental Analysis of Sex/’ 
PLATE 43. 
Fig. 1. — Experiment No. 2. Section through testis. X 21. bl. Blood 
vessels, fi. Band of fibrous tissue, tu. Degenerating tubules. 
Fig. 2. — Experiment No. 3. Section through testis. X 21. 
Fig. 3. — Experiment No. 3. Small portion of testis. X 545. 
pliag. Phagocytes. sp. Spermatozoa appearing to break up into 
chromatin granules. 
Fig. 4. — Experiment No. 4. Section through testis No. 1. X 21. 
Fig. 5. — Experiment No. 4. Section through testis No. 2. X 21. 
fi. Fibrous tissue seen to have invaded the tubules and replaced remains 
of spermatozoa, pi. pigment. 
Fig. 6. — Experiment No. 4. Testis No. 2, a portion, X 199, showing 
degenerating tubules. 
Fig. 7. — Experiment No. 4. Testis No. 1, a portion. X 250. fib v 
Fibrous tissue indicating the walls of tubules. fib. 2 . Fibrous tissue 
which has grown into the tubules, and has replaced, or is replacing, the 
remains of spermatozoa {sp.). 
Fig. 8. — Experiment No. 6. Section through testis and the tissue to 
which it is attached, x 21. tu. The remains of two tubules, pi. Pigment. 
Fig. 9. — Experiment No. 6. Small portion of testis. X 250. Showing 
part of the remains of one tubule and surrounding tissue. 
PLATE 44. 
Fig. 10. — Experiment No. 7. Section through testis. X 21. bl. Blood- 
vessels. tub v Tubules showing incipient stages of degeneration, tub.,. 
Tubules showing later stages of degeneration, fi. Fibrous band. 
Fig. 11. — Experiment No. 7. Tubules showing incipient stages of 
degeneration, x 199. 
