Specification of Pierre Alexis Francisse Bobœuf : preserving and otherwise treating animal and vegetable substances, &c.

  • Bobœuf, Pierre Alexis Francisse.
Date:
1858
Catalogue details

Licence: Public Domain Mark

Credit: Specification of Pierre Alexis Francisse Bobœuf : preserving and otherwise treating animal and vegetable substances, &c. Source: Wellcome Collection.

    17/18 (page 15)
    JBoboeufs Impts. in Preserving, cj'c. Animal and Vegetable Substances, $c. oils of coal (amongst the cheap essential oils of commerce) produce a yellow color under the action of nitric acid, and this coloring matter has been employed because cheaper than those derived from other sources; and with this former investigators were satisfied, while I, on the contrary, propound a general 5 principle, viz., that not only the essential oils of coal, but all essential oils which contain saponifiable acid oils yield yellow and other coloring matters. For the oils of peat, wood, schist, hitherto unexamined in this respect, I have given the manner of treatment which produces from them coloring matters of a similar nature; and I have detailed the method for obtaining from these oils 10 in an economical manner the tri-nitro-phenic acid, and in this method the nitric acid is used as a reagent only with those oils which are capable of yielding the required acid, and the reagent is not wasted on substances incapable of yielding it. Tri-nitro-phenic acid may be used cold as a coloring agent. With carmine and indigo it produces good greens. V 15 Treatment of Noxious and Destructive Insects, Preservation of Woods and Ships, Purification of the Air of Hospitals, &c. and' of all Places of Crowded Assembly. Various salts have been employed to preserve woods from destructive insects. One general method of effecting this consists in immersing the wood in various 20 solutions of salts, and forcing the solution into the interstices of the wood. Another method consists of immersing the wood in the heavier oils of coal. For these various solutions hitherto employed, solution of phenate of soda of 5 or 6 degrees may be substituted. This solution, while it is at least as efficacious as those previously used, has the important advantage over them of 25 being cheaper. The use of the phenate of soda will also have over the second of the older processes the advantage of leaving in the pores of the wood a fixed salt, which will permanently protect it. To protect ships from insects it is only necessary to treat with phenate of soda all the timbers and planks employed in their construction liefore the said timbers or planks are put into 30 place. By daily sprinkling hospitals, barracks, schools, &c. with solution of phenate of soda of one degree, they may be kept clear of flies, bugs, &c., and by washing bedsteads with solution of phenate of soda of 4 degrees, and forcing it into all holes and crevices which harbour bugs, those offensive creatures may be completely destroyed. 35 Purification of the Vegetable and Mineral Essential Oils which contain Saponifiable Oils. The general mass of vegetable and mineral essential oils containing acid saponifiable oils is always of a much less density than the acid oils which are