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304 DR. В. М. SALAMAN ON MALE STERILITY IN POTATOES : 
The results of the examinations made in this manner fall readily into three 
classes. The first class contains those pollens which possess 70 or more 
per cent. of living grains, and the quality of such a pollen I have, for the 
purposes of comparison, designated as “а.” The second class comprises 
pollens possessing at least 30 per cent. of living grains and not more than 70, 
and this condition has been called “ 8.’ А third class, made up of those 
possessing less than 30 per cent. of living pollen, is described as “y.” 
Relation of quantity to quality.—There is undoubtedly some correlation 
between the condition of abundant pollen and pollen of the quality “а.” 
As will be seen in the table given, the “«” standard of quality does not 
occur except in conjunction with abundance of pollen. Оп the other hand, 
abundance of pollen is by no means regularly associated with the « quality. 
This is partieularly striking in the case of Solanum Maglia, which, although 
possessing a very large quantity of pollen, does not possess more than 
15 per cent. of living grain. 
The following table will show those points perhaps more clearly :— 
| | Quantity. | Quality. 
Number. Family. | No. of А. ~ NEL 
g | «| | | 
examined, Abund, | Medium. | None ог | а. | В. | у. | 
— ` le—— | ——— — — n ——— 
A, Flourball .......... ^m | 2 НИК: | 9| 6 
*К°...... Е? of Congo x Flour- | 46 25 .. eS | 14) 9] 2 
ball seedling. '| 14 e| 10 4, 
| 7o | 6| 1 
| | 
К’........ I? of Congo x Flour- 8 7 | 49, 4 
| ball seedling. 1 e |. 1 
H'xA .... F'of (Record x Flour- 19 .. 3 .. T | 3 | 
bal)  Flourball 4 | 
seedling, | small. 
| 12 | 
none, | | 
| | | 
H'xA.... F'of(Recordx Flour-| 90 .. 4.4 
| ball  Flourbal | 8 | 
| seedling. | | small. | 
| | | non 
| | none, 
| | 
Of the 53 instances of abundant pollen given above, there were only two 
whieh possessed pollen of extremely poor quality, and these were :— 
Ке ......... No. 1. Abundant pollen, all dead. 
K? ......... No. 133. " » 98 per cent. dead. 
