LIB. II. 47. 287 



in viola) infundantur post singulas quartas horae violae 

 novae et recentes ad sexies ; turn demum nobilitatur 

 infusio, ita ut licet non manserint violae, utcunqUe re- 

 novatre, plus quam ad sesquihoram ; tameii permanserit 

 odor gratissimus, et viola ipsa non inferior, ad annum 

 integrum. Notandum tamen est, quod non se colligat 

 odor ad vires suas plenas, nisi post mensem ab infu- 

 sione. In distillationibus vero aromatum maceratorum 

 in spiritu vini patet, quod surgat primo pblegma aque- 

 um et inutile, delude aqua plus habens ex spiritu vini, 

 deinde post aqua plus habens ex aromate. Atquc 

 bujus generis quamplurima inveniuntur in distillationi 

 bus notatu digna. Verum lixc sufficiant ad exempla. 



XLVII. 



Inter preerogativas instantiarum ponemus loco vice- 

 simo tertio instantias quanti, quas etiam doses natures 

 (sumpto vocabulo a medicinis) vocare consuevimus 65 . 

 Ea? sunt quae mensurant virtutes per quanta corporum, 



65 Instantise quanti giving the Natural Philosophy has derived, in 

 ratio of Quantity to Power, however modern times, from the Arithmeti- 

 measured. This class would be cal precision thus given to scientific 

 peculiarly useful for Chemistry and details, must be allowed to be im- 

 Medicine : for the exactness of such mense ; and they would be well en- 

 proportions is the thing which ren- titled to an ample illustration in a 

 ders Chemistry a true science. See system of Inductive Logic.&quot; D. 

 Herschel s Discourse, 115, 116. Stewart s Philosophy of the Human 

 and 351. &quot; Calculation&quot; is rank- Mind, part II. chap. iv. sect. i. 

 eel by Condorcet with Observation (note). The statement respecting 

 and Experiment, when he is speak- the velocity of descent of bodies is 

 ing of Bacon s &quot; revelation of the interesting, as shewing that though 

 true method of studying Nature.&quot; Bacon does not mention Galileo, he 

 But Calculation, and quantitative was willing to accept some of his 

 Measurement, are instruments of principles. For Galileo was the first 

 discovery no how analogous to the person who boldly denied the An 

 other two ; and as Dugald Stewart stotelian thesis that bodies of un 

 says, &quot; Calculation is only one of equal weight fall equal distances in 

 the many Arts by which we are unequal times ; and proved his de- 

 enabled to give a greater degree of nial by the famous experiment of 

 accuracy to their results.&quot; He goes letting a lolb. and an lib. weight fall 

 on to say, &quot; The advantages, which from the leaning Tower of Pisa. 



