[128] PAGE 48, LINE 35. Page 48, line 39. _quæ sunt illæ materiæ._--Gilbert's list of electrics should be compared with those given subsequently by Cabeus (1629), by Sir Thomas Browne (1646), and by Bacon. The last-named list occurs in his _Physiological Remains_, published posthumously in 1679; it contains nothing new. Sir Thomas Browne's list is given in the following passage, which is interesting as using for the first time in the English language the noun _Electricities_:

"Many stones also both precious and vulgar, although terse and smooth, have not this power attractive; as Emeralds, Pearle, Jaspis, Corneleans, Agathe, Heliotropes, Marble, Alablaster, Touchstone, Flint and Bezoar. Glasse attracts but weakely though cleere, some slick stones and thick glasses indifferently: Arsenic but weakely, so likewise glasse of Antimony, but Crocus Metallorum not at all. Saltes generally but weakely, as Sal Gemma, Alum, and also Talke, nor very discoverably by any frication: but if gently warmed at the fire, and wiped with a dry cloth, they will better discover their Electricities." _(Pseudodoxia Epidemica_, p. 79.)

On the magnet, magnetick bodies also, and on the great magnet the earth — Part 179

In the _Philosophical Transactions_, vol. xx., p. 384, is _A Catalogue of Electrical Bodies_ by the late Dr. Rob. Plot. It begins "Non solum succinum," and ends "alumen rupeum," being identical with Gilbert's list except that he calls "Vincentina & Bristolla" by the name "Pseudoadamas Bristoliensis."

On the magnet, magnetick bodies also, and on the great magnet the earth — Part 179

[129] PAGE 49, LINE 25. Page 49, line 30. _non dissimili modo._--The _modus_ { 43} _operandi_ of the electrical attractions was a subject of much discussion; see Cardan, _op. citat._

On the magnet, magnetick bodies also, and on the great magnet the earth — Part 179

[130] PAGE 51, LINE 2. Page 51, line 1. _appellunt._--This appears to be a misprint for _appelluntur_.

[131] PAGE 51, LINE 22. Page 51, line 23. _smyris._--Emery. This substance is mentioned on p. 22 as a magnetic body.

[132] PAGE 52, LINE 1. Page 51, line 46. _gemmæ ... vt Crystallus, quæ ex limpidâ concreuit._ See the note to p. 48.

[133] PAGE 52, LINE 30. Page 52, line 32. _ammoniacum._--Ammoniacum, or Gutta Ammoniaca, is described by Dioscorides as being the juice of a ferula grown in Africa, resembling galbanum, and used for incense.

"_Ammoniack_ is a kind of Gum like Frankincense; it grows in Lybia, where _Ammon's_ Temple was." Sir Hugh Plat's _Jewel House of Art and Nature_ (Ed. 1653, p. 223).