55 
Massing into groups of 100, 200, etc., of seed, as with the melon, 
we have :— 
Per cent. cite alae of duplicates of 
A i Es a Vv! 
100 feed. 200 seed. 300 seed. 400 seed. 500 seed. 
86 89 88 89 89 
92 88 90 89 88 
87 90 89 88 90 
90 89 90 90 88 
89 87 89 87 88 
90 92 89 89 
87 91 86 
92 89 90 
88 87 
87 86 
97 90 
87 89 
91 
92 
84 
95 
89 
85 
89 
82 
86 
94 
91 
86 
85 
We thus note that with 50 seed, the variation in germination be- 
tween duplicates is expressed by 24 per cent.; with 100 seed 15 per 
cent.; with 200 seed by 6 per cent.; with 300 seed by 4 per cent.; 
with 400 seed by 3 per cent.; with 500 seed by 2 per cent. 
The lesson is that in germinating onion seed for comparing two 
different sources of supply, at least 200 seed should be used, and the 
differences observed should only be interpreted within the limits of 
six per cent., etc., for one year old seed, so far as this limited ex- 
perience indicates. 
As a further study into the value of duplicates, the following ta- 
bles may not be withoutsignificance. The number of seed used be- 
ing in every case 100. ‘The temperature and the moisture being the 
same for each bracketed group, and that of the office as between the 
groups. 
Germination trials. Per cent. germinated. 
Year of Dee, 6, 1884. Dec. 20, 1884. Av.ofthe Dif- 
ONION. growth. Exact duplicates. Exact duplicates. two trials. ference 
/ rie ——_—__ 
‘White Portugal 1882 30 33 30 52 31 43 12 
W hite Globe 1882 14 19 7 15 16 11 5 
White Globe 1882 39 39 50 51 39 50°41 
Large Red Globe 1882 13 16 15 15 14 15 1 
Large Red Globe 1882 34 40 41 42 37 41 4 
Large Red Globe 1882 28 32 33 84 30 33 3 
Large Red 1883 38 40 87 90 39 88 49 
Large Red 1883 be () 8 35 40 4. 37. «33 
Large Red 1882 8 11 43 45 9 44 35 
Large Red 1882 9 12 51 57 10 54 44 
Yellow Danvers 1883 42 42 61 64 42 62 20 
‘Yellow Danvers 1882 21 23 . 49 538 22 Bia yy 
