E. Stenhouse, An Introduction to Nature-study
“ The plumule and radicle are at the pointed end of the seed, and are difficult to see.The mustard seed.—In comparing the mustard seed with those [Pg 8] already described, one is struck with the great difference in size. An average broad-bean seed weighs about 600 times as much as the mustard seed. While the two fleshy cotyledons make up the bulk of the seed of the bean, pea, lupine and vegetable marrow, the cotyledons of the mustard seed are thin and leaf-like. They are folded on themselves, one inside the other (as at g, Fig. 61) , and enclose the radicle. ”
