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In 1886, M. Terby presented to the Royal Academy of Belgium notes on drawings made by Herschell and Schroeter, indicating the so-called Kaiser Sea.
They were referred by Perrotin to clouds. In March and April of the year 1886 a study was made of the surface of Mars by W.F. Denning in England. Mr. Denning's drawings corroborated the charts of Green, Schiaparelli, Knobel, Terby and Baeddicker.
Knobel in 1873, by M. Terby in 1888, and at the Lick Observatory in 1890; and they were discerned again with particular distinctness by Professor Hussey at Lick, August 27, 1896. The first photograph of Mars was taken by Gould at Cordoba in 1879. Little real service in planetary delineation has, it is true, been so far rendered by the art, yet one achievement must be recorded to its credit.
It was seen, August 22 and 24, by Dr. F. Terby of Louvain, as a short nebulous brush, like the abortive beginning of a congeries of curving trains; but appeared no more. Its well-attested presence was significant of the complex constitution of such bodies, and the manifold kinds of action progressing in them.
A strange puzzling statement was made that the canals could be traced straight across seas and continents in the line of the meridian. M. Terby confirmed many of these observations. Later the so-called "inundation of Lydia," observed by M. Perrotin, was doubted. Schiaparelli himself, Terby, Niesten at Brussels, and Holden at the Lick Observatory, failed to remark this change.
At perihelion, when in opposition with the earth, it is 35 millions of miles from the earth, and its surface, as is well known from the drawings of Kaiser, the Leyden astronomer, and of Schiaparelli, Denning, Perrotin and Terby, has apparently revealed an alternation of land and water which, with the assumption of meteorological conditions, such as prevail on the earth, has gradually made it easy to think of its occupation by rational beings as altogether possible.
Kaiser of Leyden followed in 1872 with a representation founded upon data of his own providing in 1862-64; and Terby, in his valuable Aréographie, presented to the Brussels Academy in 1873 a careful discussion of all important observations from the time of Fontana downwards, thus virtually adding to knowledge by summarising and digesting it.
An examination of the drawings in his possession showed M. Terby that they had been seen, though not distinctively recognised, by Dawes, Secchi, and Holden; several were independently traced out by Burton at the opposition of 1879; all were recovered by Schiaparelli himself in 1879 and 1881-82; and their indefinite multiplication resulted from Lovell's observations in 1894 and 1896.
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