232 ON THE INHERITANCE OF THE FLOWERING TIME IN PEAS AND RICE 
prevent cntanglcinent witli the adjoiniiiL;' plants. Wo recorded as the flower- 
ing time of every plant, the time when the standard of its first flower opened. 
Preliminary Experiments with Peas. 
Materials Used. 
When the author returned to Sapporo after four years' absence for studies 
abroad and took charge of the Department of Horticulture of the College, 
he found in the Department the stock seeds of over twenty varieties of peas 
which had been harvested in the previous year in the College Vegetable 
Garden, The dates of the flowering for all of these varieties had been re- 
corded every year, and he could select two varieties which had a difference 
of about two weeks in their flowering times. A brief description of these 
two varieties follows. 
1. Early variety; Dwarf, white-flowered, tough-podded, white-seeded; cul- 
tivated over ten years under the name of "Improved Dwarf" in our veget- 
able garden. We shall denote this variety as "I. P." 
2. Late variety; Pole, red-flowered, soft-podded, gray-seeded; cultivated 
longer than the former in the garden under the name of "'French Large 
Podded". Afterwards, we identified this variety as "Pois sans parchemin 
jeant, ä ti es large cosse", according to the description in Vilmorin-An- 
drieux' "Plantes potageres". We shall designate this variety by the ab- 
breviation "Gr. P.". 
In the early part of May, 1907, we sowed twenty seeds of G. P-; and 
when the plantlets had grown up 2 or 3 inches high, we thinned them to ten 
plants. After the sowing of the G. P. seeds, we sowed the I, P. seed three 
times at intervvils of ten days. W' hen both varieties came to flower, artificial 
crossing was practised between them, care being taken to record the pollen 
parents. When the ripened seeds were harvested, there were 54 seeds of ^ 
G. P. X S I. P- and 23 seeds of 0 I. p. x S G- P. 
