Specimens of woods should be kept in a separate room from that of the herbarium. They usually contain numerous insects' eggs, and, from timeto time, they should be put into the sulphide of carbon box. They should, as far as possible, be of uniform dimensions, and, in order that the structure of the wood maŁ be well seen, the same species should be represented by longitudinal and transverse sections, e,f. Specimens of wood should be labelled and classified with the same care and in the same order as the other collections.
It is indispensable to classify collections and to catalogue them, so that the objects that they contain may be easily found, and one may know what he owns. The catalogue should be numbered, and the numbers placed upon the tickets of the genera and species to which they correspond. This considerably facilitates researches. In order to avoid beginning a new numbering every time that additions are made, it is necessary to take works for one's guide that, as far as possible, contain the total number of genera or species of the region that one has taken as a limit. (La Nature.)
An interesting account of a new process for preserving wood was lately given in a paper read before the Western Society of Engineers, Chicago. The method referred to is known as the zinc-creosote process, dead oil and chloride of zinc being the active agents employed. It is specially suitable for railway sleepers, bridge timbers, and for situations where wood is exposed to any great degree of moisture. The timber is first of all steamed in a vacuum; the oil is then injected into the cylinder in which the wood is placed; after which the chloride of zinc is applied by pressure. It is said that the oil penetrates the pores of the wood to a certain extent, and the chloride of zinc goes to those portions unreached by the oil. According to the writer of the paper, J. P. Card, the method will give the best results of any process for the money spent.