IOWA ACADEMY OF SCIENCE 
The following table will show the difference of the diameters of the seeds In 
width and length in millimeters: 
The weight of the seeds dry are given in the following table. Gram and 
milligram weights were used: 
Iowa Blush I 
Kings 1 
Jonathon I 
Baldwin | 
Willow Twigl 
Salome 
Winesap ' I 
Greening j 
Sweet Apple | 
Crabapple | 
Northern I 
Spy 1 
Seedling | 
No. of mg. 1 seed weighs 
46 
35 
38 
49 
504 
55 
314 
30 
414 
344 
344 
2474 
33 
No. of mg. 7 seeds weigh 
304i 
211 
2701 
270 
335 
346 
229 
239 
259 
2214 
247 
No. of mg. 10 seeds weigh 
478 
No. of mg. 12 seeds weigh 
509 
4214 
462 
467 
6051 
483 
4184 
4531 
421 
4344 
No. of mg. 16 seeds weigh 
535 
954 
No. of mg. 17 seeds weigh 
641 
No. of mg. 23 seeds weigh 
9261 
915 
No. of mg. 25 seeds weigh 
1 gram 
1291 mg. 
876 
No. of mg. 28 seeds weigh 
991 
8724 
No. of mg. 26 seeds weigh 
900 
No. of mg. 20 seeds weigh 
705 
In recent years some interesting work has been carried on with reference 
to specific gravity of seeds of various kinds, especially with reference to the 
seeds of some of our horticultural and agricultural crops, in this connection the 
paper of V. A. Clark is of especial interest. Clark gives the bibliography of 
older papers on the subject, chiefly those written by Wollny®, Nobbe®, and Lyon^° 
and many others. 
The papers by Stewart and Pammel“, and Pammel, Weems and ScribneF^ give 
the specific gravity of our American seeds. 
8. Wollny, E. Saat u. Pfiege d. Landw. Kultur Pflanzen. Berlin 1885. 
9. Nobtie, F. Handbuch der Samenkunde, Berlin, 1876:313-321. 
10. Lyon, T. L. The adaptation and improvement of winter wheat. Nebr. Expt. Sta. 
Bull. 72:19. 
11. Stewart and Pammel. la. Agri. Expt. Sta. Bull. ^5:26. 
12. Pammel, Weems, Scribner. la. Geo. Surv. Bull. I:68. 
