SK(TIO\S. 



SKKDS. 



they render it piiS-ib!e ID determine (he 



genii,- by their arraii/eiiienl. In /'//// I liey 



Con; i t . ,|' bllll<lle nf elollgatl ,il|e<| 



cells, running through the wood parallel ID 

 the a\i.-of (ho Stem. These 1 hill-Will I cells 



an- densely tilled \\ it h I n i -pent ine ; in .-nine 

 cases the cells of the medullary rays ar( 

 likewi e Idled \\ilh turpentine, and, I. \dl 



1 he.,c, pei-jn ndieiilar ill I ercel I II I;. 



the latter form of turpentine-canal M chiefly 

 met \\il.h in the bark. Turpent in, 

 also exist in the leaves of the < Jonifera-, the 

 scales of the cone,, Ac. 



Tin , .if t he Aloe^ nre bundles 



of pn.-matic Cells accompanying ll . 

 lar bundles of the leaves ami itemt, TJm 

 colouring-matter of tlie root uf rhubarb is 

 contain' d in c. 1 1 - of iinj,.-i feel medullary 

 rays. The .structure of the balsam 

 voirs of the m\ rrh tree, \ t >. |, ; ,., M oi b . n 

 thoroughly studied. Tlie resin- and oil- 

 canals of the I mbellifenn are of gre.,1 im- 

 portance; but the former, chiefly occurring 

 in the roots, an- imperfect I \- known. The 

 of the iriiifs (wtf(p) consists of 

 excavations in the cellular tissue, 

 tilled \\ ith oil. ( 'anaU containing od. 

 rous oils occur in home of the ( 'ompo.-iia'. 

 li'e.-iin-cannls occur also in the common lime, 

 (iiim-canals, consisting of simple ,,r 

 })rnnched intercellular passages with a spe- 

 cial coat of small secreting colls, occur in 

 the leaf- talks of ('ycudacea', the bark ..f 

 the Aniyt/thlfrr/;\\n>. stems of the .MalvilCCCe, 

 ( 'aetaeea-, \c. Structures of similar nature 

 contiiiu the milks juices of certain plants, as 

 the Anacurdiacea- ; and t hese appea r t .. be 

 dilli'ivnt from the ordinary LSII x \. s<>ls. 



I'.i in.. Meyen, -Vc/v/. -Ori/ane d. Jy/ 

 1887,18; linger, .///. wid I'/iyn. <ltr I'/lnii- 

 zen, 18/55,204; \. 'lie^-hem, An. /S'c. Aft/. 

 1*7^, xvi.; Sachs, lint. 71). 



SUCTIONS. See I'nKi-AirviioN'; and 

 for SchieH'erdecki r's section-cut! er,*SV7/ ////.-., '.s 

 Arch. 187(5, xii. 1)1 ; a modilication, Kiddy, 

 (J><. Mic. Jn. 1877, xvii. U6; and Lewis, 

 M. ,)/..///. \vii.;U)0. 



SMMDS. These III-H interesting oltjeds 

 for microHCOpic exaininntion in respect to 

 many dillerent cluiracteri:-tics. Among 

 them may be mentioned lir^f the vnriety of 

 beautiful markings upon the surface, \\hich 

 render almost all >eds, like the c-lytra, of 

 beetles, interesting opaque objects for ob- 

 servation with n low po\\er. A few .-trik inn- 

 forms lire lepresented ill IMate .".H. li 



JH ; and we give a list of kinds easily to be 

 obtained. 



Lychnis, 

 StcUorio, 



/(V.SVY/,/. 



A ifnl'niiut. 

 I'i' I nn in. 



nyotoyaimts, 



<SV III/TI rii 1/1,1. 



fit f /ft. 

 Cii/i/ifirix. Xili'itr (IM. 



Brioa, /:/<//;,. i<;. i; , 



AnaaaiKt, (;<'iirr<t. Dimitlm* < ri. ;;:>. 



Orolxui,-/,,'. !;<</<,, iin. li ; .-. | .', i. 



/.inarm. l)<'li>liininin. J'n/>n/-f / ( I'l. .'!'.. 



( 'Inroiiin. Kr/;,/i/,/i/{i//'n. li^. M). 



M> . ni'runnllicinum. Jig. |H). 



The foil owing are Well s< en \\-hen mounted 

 nl objects in Canada b,il>am. 



Hi. Mnnnli;,/!!!. 



Orchis. Hi/dm nij <-ii. 



The i,-*i,i or outer skin of some of the 

 hitler (al.o l!< (/nn in ), \\ hen r'ino\ed from 

 the seed and viewed with a hi-h pov, , 

 hibita elegant pitted ceil,. Theaur&oeol 



the 1 . d ,,|' ( ',,/. n i . meals u ilh little .s, jd, s 

 'ing of pyriform colls containiii"- a 

 spiral fibre (I'l. L'S. |j,r. j(),. 



The surface ,,f \aiious seeds, such us Cnl- 

 li'inin and /'//////, and the pei it arp of ma ny 



ed like fi nits, .-iich as that ol A//// /*/ ai.il 



nn in, pi-. M-nl i.-niarkable II AIKH. 



'I he stones of plums or ch.iii. . > 

 called shell of the Cocoa-nu! and 

 fruits, exhibit remarkably thick SIM OKI) Oil 

 DBPOtlTfi 



The examination of the structure nf ripe 

 seeds is a matter of great importance in 

 botany. The inrestigation wiU MUT much 

 according to circumstance*, Where si 



are large, the micro, cope is only reijiiii d 

 for the examination of their li lies; h;il 

 .-mall . .ids must be examined by dis.-ection 

 \\ith needles under the simple mi< 



or by sections, \\ hi, ! i easily made 



by lixill;..' I he D||, mil , e(| into n, piece nf 



wax. Seeds have two coats, the testa and 

 //<//, or external and internal membrane, 



and, in-curding as the seed is or is nnt albu- 

 minous, an albumen enclosing theembrM,, 

 or an embryo of larger size immediately 

 invested by the coats. The chanu ters of 

 the Ai.nr.MKN mid LMIUIYO will be found 

 under these heads, as also other particulars 

 under ( )\ i I.K. l'!iiibr\os n.iv either . Moiio- 

 colylodonous or Dicotyledonous; sometimes, 

 however, the two cotyledons are s,,lder,d 



together more or less ' plelely. in the 



Conifer^ and certain genera of Dicotyle- 



