ON THE " SALT WATER SELECTION METHOD OF SEEDS. 429 



have less specific gravity than middle sized ones. On the other 

 hand, according to the results obtained by Marek'*^ and others, it 

 seems that smaller grains have a greater specific gravity than larger 

 grains, but not very regularly. 



Ando's results obtained in 1895 tend to sliow that with some 

 seeds their absolute weight does increase with their specific gravity. 

 He separated the seed of various crops according to their absolute 

 weights, and then determined their specific gravities by means of 

 the pycrometcr with alcohol. 



Kind of Crops. 



Weii^ht of 

 a ;_;rain. 

 mpr. 



Xo. of grains. 



Weiglit of 

 total grains, 

 mgr. 



A\-eragc 

 weight of a 

 grain, 

 mgr. 



Sp. gr. 





Over 32 



50 



1649.6 



32-09 



1. 2241 



Rice ; .sort, 

 S/;iral<viia. 



28—32 

 24—28 



SO 



50 



1521.0 

 13258 



30.42 

 26.52 



1.2151 

 1. 1812 





20 — 24 



^0 



1 1 10.2 



22.20 



1. 1 20 1 





Below 20 



50 



847.4 



16,95 



0.9912 





Over 60 



50 



3176.2 



63.52 



I 2932 





55-60 



50 



28860 



57-52 



1. 2851 





50—55 



50 



2661.8 



53-24 



1.2603 



Barley ; sort, 



45-50 



50 



2425 2 



48.50 



1.2644 



Golden melon. 



40—45 



50 



2149.6 



42.99 



1-2573 





35—40 



50 



1886.4 



37-73 



1.2300 





30—35 



50 



1642.2 



32.84 



1.2418 





Below 30 



50 



1286.4 



25-73 



I-I993 





Over 45 



30 



1457.0 



48-57 



1.2856 



Barley ; sort, 

 Ilozoroi. 



40—45 

 35—40 



30 



30 



1289 4 

 1 140.8 



42.98 

 38-03 



1.2658 

 1.2762 





30-35 



30 



1018.2 



33-94 



1.2520 





Below 30 



30 



781.6 



3605 



•-2375 



(8) Marek, Das .Saatgut und dessen Einfluss auf Menge und Gute der Ernte, Wien 1875. 



