VI 
LIST OF PLATES IN VOLUME XXL 
1. Curves of Temperature of Lakes See page 53 
2. Anatomy of a five-leggecl Frog 169 
3. Development of Hyla versicolor . 104 
4. Curves of Temperature of Trees . 294 
5. Mouth-structure of native Tadpoles 307 
6, 7, 8. Mechanism for Cross-fertilization of several plants 410 
9. Development of Molgula manhattensis 441 
DATE OF PUBLICATION OF EACH SIGNATURE IN VOLUME XXL 
Sig. 
1 . 
July, 23, 1881. 
Sig. 
16. 
Feb. 7, 
1882. 
Sig. 
2. 
Aug. 16, 1881. 
Sig. 
17. 
March 4 
:, 1882. 
Sig. 
3. 
Aug. 16, 1881. 
Sig. 
18. 
March 10, 1882. 
Sig. 
4. 
Nov. 5, 1881. 
Sig. 
19 
April 18 
I, 1882. 
Sig. 
5. 
Nov. 5, 1881. 
Sig. 
20. 
May 19, 
1882. 
Sig. 
6. 
Nov. 5, 1881. 
Sig. 
21. 
May 27, 
1882. 
Sig. 
7. 
Nov. 5, 1881. 
Sig. 
22. 
June 15 
, 1882. 
Sig. 
8. 
Nov. 5, 1881. 
Sig. 
23. 
July 6, 
1882. 
Sig. 
9. 
Nov. 21, 1881. 
Sig. 
24. 
July 17, 
1882. 
Sig. 
10. 
Nov. 28, 1881. 
Sig. 
25. 
Sept. 6, 
1882. 
Sig. 
11. 
Dec. 15, 1881. 
Sig. 
26. 
Oct. 12, 
1882. 
Sig. 
12. 
Jan. 7, 1882. 
Sig. 
27. 
Nov. 3, 
1882. 
Sig. 
13. 
Jan. 7, 1882. 
Sig. 
28. 
Feb. 5, 
1883. 
Sig. 
14. 
Jan. 30, 1882- 
Sig. 
29. 
Feb. 21, 
1883. 
Sig. 
35. 
Jan. 30, 1882. 
March 21, 1883. 
