They are, however, of difficult and uncertain ascription, since the collections have been largely amended and remodelled as practice required.
This afforded great satisfaction to Ivan, but it did not entirely satisfy his requirements, because the new route by the White Sea and North Cape was long and uncertain and for a great part of the year communications were stopped by the ice.
Geologically the anthracite and bituminous coals mainly belong to the same formation, the Carboniferous, and this is especially true of the better qualities; though it is stated by the United States Geological Survey that the geQlogic age of the coal beds ranges from Carboniferous in the Appalachian and Mississippi Valley provinces to Miocene (Tertiary) on the Pacific coast, and that the quality of the coal varies only to a very uncertain degree with the geologic age.
Himilco, a contemporary of Hanno, was charged with an expedition along the west coast of Iberia northward, and as far as the uncertain references to this voyage can be understood, he seems to have passed the Bay of Biscay and possibly sighted the coast of England.
The Doge Domenico Selvo began the decoration of the church in 1071, though it is uncertain whether any of his work can be now identified.
It was then that a clerk who saw that there was but an uncertain prospect of help from the pope of his time, conceived the shrewd idea of appealing to the popes of the past, so as to exhort the contemporary generation through the mouth of former popes, from Clement to Gregory.
More attention seems to have been given to the matter in the United States of America and in Germany and Russia than in England, but the infinite variety of samples known to the commercial expert, and the impossibility of standardizing those in such a manner as to make readily recognizable what the chemist has treated, renders most of the recorded analyses of uncertain value.
No less than twelve species, referred to three sub-genera (Demiothecia, Idiothecia, Orthoecus), have now been described; but it is at present uncertain whether more than a single species of Rhabdopleura is valid, although several specific names have been suggested for specimens from different localities.
It is uncertain what official had the charge of the corn supply at Puteoli under the Republic, but in the time of Antoninus Pius we find an Aug(usti) dis(pensator) a frumento Puteolis et Ostis dependent no doubt on a procurator annonae of the two ports.
The details of the final and successful plot were uncertain - the martyr Wishart cannot be identified with Wishart the would-be murderer - but with Beaton practically expired the chances of the French and Catholic party in Scotland.