General Repertory of Mineralogical, Mining, and Salt Works Literature

5. Christ. Mayer, specimen de terra eiusdemque dotibus explorandis specimen concerning earth and the exploration of its qualities. Heidelberg. 1760. 4to. 4 sheets.
6. Johann Helfenzrieder's treatise on the use of earth and sand, or ash, for extinguishing conflagrations, to halt them, and some other means useful for this purpose, or at least for the reduction of the resulting damage. Augsburg. 1797. large 8vo. 134 pages, with 3 copperplates.

Allg. Lit. Zeit. General Literary Gazette 1798. Jan. p. 85: contains some clever ideas and proposals, though admittedly not yet fully tested.
7. D. Johann Heinrich Piepenbring's guide to the knowledge of the various types of arable soil and the fertilizers and soil improvers with which fields are to be fertilized and improved most appropriately in any case. Hanover. 1797. 8vo. 14 1/2 sheets.
Neue allg. d. Biblioth. New General German Library XXXV. 2. p. 334: quite good, and presented entirely according to chemical principles.

§. 3.

Section III,

on stones in general *).

1. Lapidarium s. Opus de lapidibus Lapidarium, or work on stones. Vienna. 14... 4to.
2. Camilli Leonardi speculum lapidum Camillo Leonardi's Mirror of Stones. Pesaro. 1502. 4to.
——— Venice. 1516. 4to.

*) See also Mineralogy. Part II. §. 2. No. 3. §. 203. No. 1.