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Some accuse them of taking the ova of trout, and they are shot at trout nurseries; but it is doubtful if they are really guilty, nor can they do any appreciable injury in an open stream, not being in sufficient numbers.
In the strings the young ova are distinguished by their considerable size from the surrounding follicle-cells. Two young Graafian follicles, isolated. In the male mammals there is the same fusion of the Mullerian and Wolffian ducts at their lower ends.
But we have seen that worms eagerly devour raw meat, fat, and dead worms; and ordinary mould can hardly fail to contain many ova, larvae, and small living or dead creatures, spores of cryptogamic plants, and micrococci, such as those which give rise to saltpetre.
In a short time, probably within a few days of receiving the ova, the amateur will find that the young fish are beginning to hatch out. They generally come out tail first, and in wriggling this about in their attempts to get further out, they propel the ovum about the bottom of the tray.
I have found as many as eighteen caterpillars in the stomach of a trout which I caught under an overhanging oak tree. The amateur who is beginning trout culture had better by all means buy eyed ova from a fish cultural establishment. There are many of these in the British Isles, and nowadays eyed ova are packed and sent safely all over the country.
Many attempts have so far failed to acclimatise the salmon. The ova may be hatched out successfully, but the fish when turned out into the rivers disappears. The golden carp, however, the perch, and the rainbow trout take readily to New Zealand. The hare increases in size and weight, and has three and four leverets at a birth. The pheasant has spread from end to end of the Colony.
The easiest way is, of course, to buy yearling or two-year-old fish from a piscicultural establishment, of which there are many in the kingdom, but I know that there are many fishermen who would much prefer to rear their own fish from the ova, than to buy ready-made fish.
Follow the course of opinion on the great subjects of human interest for a few generations or centuries, get its parallax, map out a small arc of its movement, see where it tends, and then see who is in advance of it or even with it; the world calls him hard names, probably; but if you would find the ova of the future, you must look into the folds of his cerebral convolutions.
"Toil and grow strong; by toil the flaccid nerves Grow firm, and gain a more compacted tone." Ovulation. At birth the formation of the ova is nearly completed; the production of' new cells probably ceases after the second year. The ovaries of the child of two years contain, therefore, the full quota of ova, although the vast majority of these cells always remain immature and undeveloped.
The experiments therefore are entirely irrelevant to what has been called the inheritance of acquired characters. All that they can be said to prove is that an albino soma does not convert ingrafted ova of black race into ova carrying the albino character. It is probably impossible to prove experimentally the influence of a modified soma in one generation.
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