follow a certain revealed law, is, nevertheless, still very large and sufficient to tax his energies. Witness, for example, the host of observed phenomena obeying the law of inverse squares!
The remaining sections of Littrow's article deal with the reduction of the experiments to the laws of motion, the numerical expression of the observed results in definite units, the importance of the part played by instruments or mechanical appliances, derivation of laws governing the observations, methods of ascertaining these laws, methods of reduction and of publication, and errors to be avoided.
These two articles will show sufficiently the character and scope of similar ones we should like to see in our standard English and American encyclopedias. Such information is contained in some measure, at least, though not as comprehensively, in the modern German book of reference, Brockhaus's "Conversations-Lexikon," as also in the "Grande Encyclopedia" of the French. It is truly remarkable that there should be such an oversight in our "International Encyclopedia," when it is remembered that the editor-in-chief was one to whom research work owes a very great debt of gratitude indeed—the late and greatly lamented Daniel Coit Gilman. The only article found is one on "expert," and this pertains chiefly to "expert evidence" in courts of law. Yet what better statement concerning the "research or scientific spirit" could be made than contained in the following quotation from Gilman's writings?
- "Chamber's Encyclopedia" is found to contain a short article on "Experiment"; also one on "Observation."
- Extracts from the "Launching of a University," 1906, pp. 147-150.