82 INDEX. 



Frog, observations on the changes of the ovum of, during the 



formation of the tadpole, xix. 295 

 Frost, test for the action of, on building materials, xvii. 148. 



xix. 136 

 Frost (Mr.), syllabus of his course of lectures upon Botany, xvii. 



2S4. Remarks on the mustard-tree of the Scriptures, xx. 57. 



On a new emetic oil, 59. On the expressed oil of the seeds 



of the croton tiglium, 231 

 Fruits, action of carbonic acid gas on, vii. 385. Observations on 



the ripening of, xi. 395 

 — — (green), influence of on the air, xiii. 152 

 Fruit-trees, beneficial effects of salt in making them productive, 



X. 61 ; and in rendering them unfit for the habitation of 



worms or insects, 63. Ripening of wall-fruit, how facilitated, 



448. To protect fruit from wasps, ibid. 

 Fuel, remarks and experiments on the economy of, xiii. 58 



comparative advantage of coke and wood for, xvii. 36 1 



Fuller's earth discovered in chalk, xi. 220 

 Fulminating gold, preparation of, viii. 368 



. — ■ — mercury, explosion of, x. 182 



. ■ powders, explosion of, xix. 348. Notice of Moretti's 



fulminating acid, 349 

 silver and mercury, results of experiments on, xvii. 153 



Fulminic acid and Fulminates, experiments on the analysis of, 

 xvii. 386 



Functions of the human body, observations on the periodical sus- 

 pension and renewal of, vi. 1, 20 



Fungi, structure and fructification of, vi. 222 



which tinge snow red, experiments on, x. 395 



notice of a new species of, xv. 172 



Furnace grates, improvements in, 140 



Fusible metal, preparation and application of, xiii. 444 

 IFusiNiERi (Signor), researches on the colour acquired by metal 

 when heated, viii. 362 



