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If the change is a combination, or coalescence, of two things into one, then the mass, and hence the weight, of the product is equal to the sum of those masses, and hence those weights, of the things which have united to form it; if the change is a separation of one distinct substance into several substances, then the sum of the masses, and hence the weights, of the products is equal to that mass, and hence that weight, of the substance which has been separated.
The pleasant green commons or squares which occur in the midst of towns and cities in England and the United States most probably originated from the coalescence of adjacent mark-communities, whereby the border-land used in common by all was brought into the centre of the new aggregate.
Mary's countenance was as still as ever; there was not in it a single ray of light beyond its usual expression; but I had become more capable of reading it, for the coalescence of the face of my dream with her dreaming face had given me its key; and I was now so far from indifferent, that I was afraid to look for fear of betraying the attraction I now found it exercise over me.
But even the truest Seers in the Church of God would hardly have dared to predict that in a comparatively few years the final outcome of this trend in events would be an absolute coalescence into one vast system of the world's many religious systems and of the world's commerce.
Taking each particle as a centre, and surrounding it by a circular wave with a radius equal to the distance between m n and m' n', the coalescence of all these little waves would build up the large ridge m' n' exactly as we find it built up in nature.
The idea of the endosperm as a second subsidiary plant is no new one; it was suggested long ago in explanation of the coalescence of the polar nuclei, but it was then based on the assumption that these represented male and female cells, an assumption for which there was no evidence and which was inherently improbable.
In effect, they are now held apart in many respects by measures of precaution against their coming to a common plan of use and wont. The degree of coalescence would scarcely be extreme; more particularly it could not well become onerous, since it would rest on convenience, inclination and the neglect of artificial discrepancies.
This would not, however, explain the formation of fruits intermediate in size and colour between those of crossed parents. The signification of the coalescence of the polar nuclei is not explained by these new facts, but it is noteworthy that the second male-cell is said to unite sometimes with the apical polar nucleus, the sister of the egg, before the union of this with the basal polar one.
But it is a ready-made generalisation that only those communities are incorporated in this cosmopolitan coalescence of usage that are moved by their own incitement, and only so far as they have an effectually felt need of conformity in these premises.
Again, the processes of development presented by some of these creatures do not by any means point to an origin through the linear coalescence of primitively distinct animals by means of imperfect segmentation. Again, Nicholas Wagner found in certain other Diptera, the Hessian flies, that the larva gives rise to secondary larvæ within it, which develop and burst the body of the primary larva.
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