70 THE HISTORY OF SCIENCE 



125. Miscellaneous History of various Artificial Materials, 

 Enamel, Porcelain, various cements, etc. 



126. History of Salts. 



127. Miscellaneous History of various Machines and Mo- 

 tions. 



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 classifica- 

 tion 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, 



