602 - Proceedings of the Royal Society 
seem equivalent, also perhaps oTaSiov and spatium, o-k€7tw and 
specio, o-KvXtv (o and spolio. 
In conclusion, on this modification of original roots by the 
adjection of an initial sibilant, I shall revert to a set of words 
already noticed — viz., ypa<£w, y\acf)a), y\vcf> to. These words are of 
analogous meaning ; and it is interesting to see whether we can 
find corresponding and cognate words in Latin. I think the Latin 
words scalpo and sculpo are in this situation. These words seem 
to be formed by prefixing a sibilant to the radical elements of the 
G-reek forms which consist of a guttural y or c, a liquid l or r, and 
a labial or 7 r. Now these elements, with a slight metathesis, 
may become ypair or glap, yapir or galp ; prefixing an s we have 
scalp and sculpo, which words indicate operations of a kindred 
kind, that of carving or embossing. Some philologists, of whom 
Salmasius is one, consider that by a similar process ypa^oj becomes 
scribo. 
I now conclude these few observations, not unconscious that 
some of the conjectures and speculations which have been ven- 
tured may be overstrained, or in some respects mistaken. But I 
feel considerable confidence that the general views I have expressed, 
most of which are derived from higher sources than my own 
opinions, are correct in substance, and are calculated to afford con- 
siderable aid in the continuous progress which philology is making. 
4. De l’interpolation des fonctions irrationnelles en general, et 
des fonctions logarithmiques en particnlier, a l’aide des 
tables numeriques. Par F. Lefort, inspecteur general des 
Ponts et chaussees, membre correspondant de l’Academie des 
Sciences de Naples. 
Introduction. 
Pour faire un usage intelligent destables des fonctions irrationelles 
en general, et des tables de logarithmes en particulier, il est indispens- 
able de conaitre les formules fondamentales de l’interpolation, et 
de savoir se rendre compte du degre d’approximation que 1’on 
peut obtenir dans les differents cas. Je traite dans ce memoire 
ces deux points qui sont a peine indiques dans la plupart des 
