that in the Southern portions it was obtained from the earthen floors of tobacco houses. The presentation of the earliest methods of getting nitre is extremely interesting, extended and elaborate, giving the reader a full view of pioneer conditions and endeavor. The scheme of purification of nitre for gunpowder use is illuminating and attractive. Attention is directed to the saltpetre rock and caves of the western portion of our country. The preparation of charcoal is discussed. The adaptability of charcoal from various sources receives careful thought in connection with its use in gunpowder; so, too, the sulphur used for this particular purpose, and there is recommended as a source of this ingredient, the common pyrites so abundant throughout the States. Among other topics, of vital interest in these days, discussed in the continuing articles, is the manufacture of spirit from potatoes. The method employed in Germany is presented in detail after which it is said-- "Potato spirit of excellent quality has been made in this city (Philadelphia). It is found, not only to be much cheaper than grain used entirely, but to afford better flavoured liquor and other qualities which give it a decided preference." Fermentation, yeast and baking receive mention. Brewing and the different kinds of beer are fully examined. In those days adulteration was practiced, for wormwood and quassia were found as substitutes. The preparation of beer and ale for home consumption would very likely find little favor in the "dry-bone" spirit of the present, much less would the refining of wines and other spirituous liquors of high alcohol content meet with approbation. However, such prohibitory questions as are now discussed did not vitally concern our forefathers, so that it was most proper and praiseworthy to advise the public how, through the instrumentality of chemistry, many of the needed articles of life might be made in the highest degree of purity. In many homes there existed miniature brewing plants. At the other extreme, among useful commodities, were the manufacture of fish glue, common glue, gelatine, albumen, magnesia alba, etc. The several articles thus published in one of the most respected and influential papers of that early day--1808--had for their purpose the education of the general public in the application of a science to their use, but there was also a desire to arouse a deep and steady interest in science in general, which seems quite plain from a quotation from that remarkable address of Dr. John Morgan--at one time Physician-in-Chief of the American Army. The passage was-- "Oh! let it never be said in this City or in this Province, so happy in its climate and in its soil, where Commerce has long flourished and plenty smiled, that science, the amiable daughter of liberty and sister of opulence, droops her languid head, or follows behind with a slow, unequal pace."