125. Miscellaneous History of various Artificial Materials,--Enamel, Porcelain, various cements, etc. 126. History of Salts. 127. Miscellaneous History of various Machines and Motions. 128. Miscellaneous History of Common Experiments which have not grown into an Art. _Histories must also be written of Pure Mathematics; though they are rather observations than experiments_ 129. History of the Natures and Powers of Numbers. 130. History of the Natures and Powers of Figures. The fragment containing this catalogue (_Parasceve_--Day of Preparation) was added to Bacon's work on method, _The New Logic_ (_Novum Organum_), 1620. Besides completing his survey and classification of the sciences (_De Augmentis Scientiarum_), 1623, he published a few separate writings on topics in the catalogue--_Winds_, _Life and Death_, _Tides_, etc. In 1627, a year after his death, appeared his much misunderstood work, _Sylva Sylvarum_. He had found that the Latin word _sylva_ meant _stuff_ or _raw material_, as well as a _wood_, and called this final work _Sylva Sylvarum_, which I would translate, "Jungle of Raw Material." He himself referred to it as "an undigested heap of particulars"; yet he was willing it should be published because "he preferred the good of men to anything that might have relation to himself." In it, following his catalogue, he fulfilled the promise made in 1620, of putting nature and the arts to question. Some of the problems suggested for investigation are: congealing of air, turning air into water, the secret nature of flame, motion of gravity, production of cold, nourishing of young creatures in the egg or womb, prolongation of life, the media of sound, infectious diseases, accelerating and preventing putrefaction, accelerating and staying growth, producing fruit without core or seed, production of composts and helps for ground, flying in the air. In the _New Atlantis_, a work of imagination, Bacon had represented as already achieved for mankind some of the benefits he wished for: artificial metals, various cements, excellent dyes, animals for vivisection and medical experiment, instruments which generate heat solely by motion, artificial precious stones, conveyance of sound for great distances and in tortuous lines, new explosives. "We imitate," says the guide in the Utopian land, "also flights of birds; we have some degree of flying in the air; we have ships and boats for going under water." Bacon believed in honoring the great discoverers and inventors, and advocated maintaining a calendar of inventions. He was a fertile and stimulating thinker, and much of his great influence arose from the comprehensiveness that led to his celebrated classification of the sciences. REFERENCES Bacon's _Philosophical Works_, vol. IV, _Parasceve_, edited by R. L. Ellis, J. Spedding, and D. D. Heath. Karl Pearson, _Grammar of Science_. J. A. Thomson, _Introduction to Science_. CHAPTER VI