IN THE TROPICS. 
353 
(3) In the colour of the testa certain complications occur. 
These are described in terms of Mendel’s theory by the aid 
of the hypothesis of latency. (Examples VI., VII.) 
(4) The shape of the seeds of peas depends upon several 
factors, of which some account is given. (Example VI.) 
(5) The time of flowering of hybrid peas showed in one 
instance a correlation with the colour of the flowers. 
(Example IX.) 
(6) Some of the observations of Correns upon maize were 
confirmed. (Examples II., IV., V.) The process of re-cross¬ 
ing with the recessive was carried out on a considerable 
scale in one case, and Mendei’s conclusion fully confirmed. 
(Example IV.) In the case of the allelomorphs blue and 
non-blue aleurone layer, Mendel’s Law was shown to hold 
good in spite of great irregularity in the visible development 
of these characters. (Example V.) 
LIST OF LITERATURE. 
1. Bateson , W., Materials for the Study of Variation ... 1894 
2. -- Mendel’s Principles of Heredity ... 1902 
3. -Note on the Resolution of Compound Characters 
by Cross-breeding, Camb. Phil. Soc. Proc.XII., p. 50 ... 1902 
4. -Nature LXVII. pp. 462,585 ; LXVIIL, p. 33 ... 1903 
5. -- The Present State of Knowledge of Colour Here¬ 
dity in Mice and Rats, Proc. Zool. Soc. II., p. 71 ... 1903 
6. — and E. R. Saunders , Reports to the Evolution Com¬ 
mittee of the Royal Society, No. 1 ... ... 1902 
7. Blackman, V. H ., Some Recent Work on Hybrids in 
Plants. New Phytologist 1.4 ... ... 1902 
8. Biffen , R. H., Experiments on Wheat. Nature ... 1903 
9. Castle , W. E., The Heredity of Sex. Bull. Muss. Comp. 
Zool. Harv. ... ... ... 1903 
10. Correns , C ., Untersuchungen über die Xenien bei Zea 
Mays. Ber. deut. bot. Ges. XVII., p. 410 ... 1899 
11. -G. Mendel’s Regel über das Verhalten der Nach¬ 
kommenschaft der Rassen-bastarde. ibid. XVIII., p. 158 1900 
12. -—- Gregor Mendel’s “ Versuche über die Pflanzen¬ 
hybriden ” und die Bestätigung ihrer Ergebnisse durch 
die neuesten Untersuchungen Bot. Zeit. 58, p. 229 ... 1900 
13. —— UeberLevkoyenbastarde. Zur Kentniss der Grenzen 
der Mendelschen Regeln. Bot. Centbl. ... 1900 
