A Synopsis of Biology by W. B. Crow (Auth.)

By W. B. Crow (Auth.)

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The hilum represents the first point of deposition and the strata are due to the deposit of alternating layers of differing material. The hilum THE CELL 19 may be central and the strata concentric as in starch grains of wheat, or the hilum may be excentric as in potato starch. When there is more than one centre of deposition in a single leucoplast, c o m p o u n d g r a i n s arise. Compound grains are best developed in grasses and chenopods ; in the latter family there may be very many centres in each grain.

38 FORM AND STRUCTURE Plasmogamy, continued. at in which two nuclei are found together in the same cell (dikaryon). This is maintained as a definite stage in the life-cycle, as the two divide together and their products remain closely associated for a number of cell-generations. HOLOGAMY The condition when gametes are not differentiated from somatic cells (see below). I t is usually termed conjugation. Unfortunately the latter term is used in two different senses, sometimes being applied to any equal fusion.

Hertwig pointed out t h a t fusion of egg and sperm nuclei was involved. Two views as to the nature of sex are held : (1) That it is a universal phenomenon, occurring in organic and inorganic worlds ; in this connexion Thesing* mentions t h a t soft crystals of paraazoxy-benzoic-acid-ethyl-ester, placed in contact, fuse to form larger units t h a t later divide ; (2) That it has gradually evolved in the organic kingdoms, in this connexion note many lower organisms are asexual and degrees of sexual differentiation occur.

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