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"Yes; a slight lesion in the grey matter, that is all; a trifling rearrangement of certain cells, a microscopical alteration that would escape the attention of ninety-nine brain specialists out of a hundred. I don't want to bother you with 'shop, Clarke; I might give you a mass of technical detail which would sound very imposing, and would leave you as enlightened as you are now.
The chief importance lies in differentiating tuberculous disease from lympho-sarcoma and from lymphadenoma, and this is usually possible from the history and from the nature of the enlargement. Signs of liquefaction and suppuration support the diagnosis of tubercle. If any doubt remains, one of the glands should be removed and submitted to microscopical examination.
Several extensive streams, however, belonging to this series, retain their stony character; these are either of a blackish-green colour, with minute acicular crystals of feldspar, or of a very pale tint, and almost composed of minute, often scaly, crystals of feldspar, abounding with microscopical black specks; they are generally compact and laminated; others, however, of similar composition, are cellular and somewhat decomposed.
Feeling as small as one of our microscopical specimens, almost infinitesimally tiny as I descended into his Titanic arms, I was handed down the steps to him. He was dressed in a kind of long surplice, underneath which as I could not, even in that moment, help observing the air gathered in long bubbles which he strove to flatten out.
No one will attempt to construct a science, unless he have some idea to rest on as a proper basis. But, in the elaboration of the science, he finds that the schema, nay, even the definition which he at first gave of the science, rarely corresponds with his idea; for this idea lies, like a germ, in our reason, its parts undeveloped and hid even from microscopical observation.
In one day we passed through two spaces of water thus stained, one of which alone must have extended over several square miles. What incalculable numbers of these microscopical animals! The colour of the water, as seen at some distance, was like that of a river which has flowed through a red clay district; but under the shade of the vessel's side it was quite as dark as chocolate.
From the appearance of the pale-coloured, fine-grained beds, I was inclined to believe that they corresponded with the upper beds of the S. Cruz; but Professor Ehrenberg, who has examined some of the specimens, informs me that the included microscopical organisms are wholly different, being fresh and brackish-water forms.
It occurred to Waller that by destroying such centres, or by severing the connection at various regions between a nervous tract and its trophic centre, sharply defined tracts could be made to degenerate, and their location could subsequently be accurately defined, as the degenerated tissues take on a changed aspect, both to macroscopical and microscopical observation.
I can hardly believe Martyn and Mary parents to this grown-up family. They look as youthful as ever, and are as active and vigorous, and full of their jokes with one another and their children. They are now gone out to the point of the rocks at the end of our promontory, fishing for microscopical monsters, and comporting themselves boy and girl fashion.
The veinstone is pure quartz containing water in microscopical cavities, as in the quartz crystals of granite, but not combined as in the hydrous siliceous sinter deposited from hot springs. The lodes are not ribboned, but consist of quartz, jointed across from side to side, exactly like trappean dykes.
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