MYioho.MATIA OF 1HK LEGUMINOSAE. 103 



decay and break-up of tin- tubercles, reach the soil ready to 

 brin-- ;iliout new infections. 



The great important.-!- of the tubercle- of I.euumiii'^ae is 

 that the plants bearing them are capable of taking up i 

 nitrogen from the atnio<phere and utilizing it, while without 

 the tubercles they could not do so. 1 If Le.miminosae be -rown 

 in soil rich in nitrogenous food-substances, the tubercle- are 

 not si i wi-11 dr Veli i] ied. 



According to Schneider, 2 tin- host-plant under the intliu-m ,- 

 of the Ji'/t /:<-///// in produces cellulose tubes, wliieli become tilled 

 with the fungus. According to Heyerinkv these tubes consist 

 of bacterial slime secreted by the Jllir.nl, imn. The epidermal 

 tissue of the tubercles consists of a loose layer of cork with 

 many intercellular spaces ; this arrangement is stated by Frank 4 

 to facilitate the usual transpiration."' 



1 Hellriegel u. Wilf.irtli, /;.//'-/,/, <l. deutech. botan. Gea., lsv: ;ilsn '/. ;/-h,-i/r 



f. il. Ri/>" ii-.in-k, ,--I,i<l,i*t,-;< , 1SS8. 



-/;./. /. i/> nt*i-ft. iio'mi. <;<., is<i4, j). 11. 



''<' iitf(tll,l. J. llnrl. ,:,!, ,',, ,1. l',irti*it> nkiiii'li , 1 S94. 



1 r r. <l. iliHtM'h. Ixi'fin. Ges., 1892. 



-. lilli-iil. ! ( r,nll> I'm </ 'If '/'.//.// Club, ISil-Ji. gives a slmrt iici-iuuil "t 

 i /i'/c'-.'-/,/V(, ami n't.-rs tn the rhi.-t \\,,rks mi this siihji-rt. (l-Mit.) 



