VOLUMES ONE TO TWENTY-FIVE. 



14;: 



Plants, on fil>rous covering of, by 0. K. 

 Vacj', vii. till. 



' , can they use atmospheric nitrogen ? 



xvii. 58 ; opinions of Bonssingault anil 

 Ville, ib. 



, structure of (Henfrey), xvii. 73 ; 



cells of, illustrated, 74 ; increase of 

 cells, or plant growth, 77. 



, their food inorganic (Liebig), xvii. 



292. 



, atmospheric nutrition of, lecture 



on (Dr. Voelcker), xxv. 531 ; the hu- 

 mus, or vegetable-mould theory, 532 ; 

 composition of the atmosphere, ih. ; 

 atmospheiic nitrogen not assimilated 

 by plants (Boussingault, and Lawes 

 and Gilbert), ih. ; office of oxygen and 

 carbon, ih. ; small percentage of car- 

 bonic acid in the air (De Saussure), 

 533 ; its sufficiency for most jslants ih. ; 

 office of carbonaceous matters in the 

 soil, ib. ; ak in soil largely charged 

 with carbonic acid, as determined by 

 Boussingault's expiriments, ib. ; how 

 root-ci-ops absorb carbon, 534 ; atmo- 

 sjiheric ammonia, Boussingault's and 

 Bineau's researches, ib. ; ammoniacal 

 feiiilisers more suited to cereals than 

 green crops, 535 ; use of nitrogenous 



' manure, ih. ; danger of hasty generali- 

 sation, ib. ; indirect influence of the 

 atmosphere on plant nutrition, ib. ; 

 aeration of tlie soil, 536 ; quantity of 

 organic nitrogen in soil, ih. ; influence 

 of the air on clay soils, 53G ; Discussion, 

 Hy. ; percentage of nitrogen in Peru- 

 vian guano, ib. ; large amount of 

 nitrogen in clover roots (Mr. Holland), 

 ih. ; effects of feeding of, as compared 

 witli mowing (Mr. Coleman), 538. 



have no selecting power, but ab- 

 sorb by endosmosis (Voelcker), xviii. 

 144. 



Plastic clay, the soils of, by J. Trimmer, 



xii. 454. 

 , analysis of, by Dr. Voelcker, xii. 



506. 

 , the farming of the light soils of 



(Haxton), xv. 92. 

 soils of Oxfordshire (Bead), xvi. 192. 



soils of Buckingliamshire (Read), 



xvi. 272. 



Playfair, Lyon, on the application of 

 pliysiology to the rearing and feeding 

 of cattle, iv. 215. See " Cattle." 



, on tlie nature and causes of the 



decay in potatoes, vi. 532. 



, analysis of a nrarl which having 



been used for manure rendered the 

 subsequent application of manures in- 

 operative, vi. 575. 



rLorGHiNa. 



Playfair, Lyon, analysis of the soil and 

 subsoil of a verj' productive field at 

 Sutton in Norfolk, vi. 577. 



Pleuro-pneumonia in cattle, by G. 

 Waters, a prize essay, ix. 343. 



, on the organs of respiration and 



circulation, with especial reference to 

 ])leuro-pneumonia in the ox, by J. B. 

 Simonds, x. 570. 



, on inoculation for, by J. B. Si- 

 monds, xiii. 373, xiv. 244. 



, its effect in diminishing tlie milk- 

 supply (T. Horsfall), xviii. 151 ; pre- 

 monitory symptoms, 189; treatment 

 and remedies, ib. ; cocoa oleiu, its pro- 

 perties, 190; insidious natiu'c of the 

 disease, 191 ; laboured inhalation im- 

 plies consumption of carbon, 191, 193; 

 food rich in starch and sugar benefi- 

 cial, 192. 



, in 1841, not an imported disease 



(J. B. Simonds), xviii. 201 ; most pre- 

 valent in badly regulated sheds and 

 on cold, retentive soils, ib. ; its infec- 

 tious character, ib. ; tliis tlieory ques- 

 tioned by Mr. Thompson, note, ih. ; 

 pathology of the disease, 202 ; the 

 lung affected before tlie pleura, 203 ; 

 prevalence of the disease in North 

 Holland in 1857, 208; said to have 

 been observed in Hanover as early as 

 1807, 211; precautionary steps taken 

 by the Danish government against tlie 

 spread of pleuro-pneumonia, 214 ; in 

 early stages of the disease, tlie flesh of 

 slaughtered animals is fit for food, 217; 

 precautionary mcasm-es against tlip 

 disease at Liibeck, 220 ; do not restrict 

 the trade in hides, 221 ; ontlireak of 

 tlie disease in the duchy of Mecklen- 

 burg, 1856, 222. 



, on the use of inoculation in. 



(Eeiset), xxiv. 437. 



Plough, paring ; on a new paring-plougli 

 at Chester (1858), xix. 344. 



, tlie Jersey, xx. 47. 



, Smith's (Deanstone) .subsoil plough, 



xvii. 552; Gray's (Uddington) ditto, 

 ih. 



, double, still used in Warwickshire, 



(Evershed), xvii. 481. 



, turnwrest, at Chelmsford meeting, 



xvii. 576. 



, trials of at Paris meeting, 1856, 



xvii. 39 ; table of results, 40. 



, in Bedfordshire the common plough 



preferred to Bentall'sbroadshare Ben- 

 nett), xviii. 9 ; Howard's two-wheel 

 iron plough, an extraordinary success, 

 22. 



Plovghint, in Norfolk, v, .307, 



