IQ 6 BOTANICAL GAZETTE. 



[ April, 



cur, but they certainly are not so prominent or numerous as 

 \5?5 and the other Conif era3 studied (fie. 10) 



mPnY r V hC bUndIC ^ Si ? glG and medlan ' ' lt haS in SOme 



measure the appearance of having been formed by the co- 

 alescence of two bundles. If this be true, the coalescence 

 Wtn * t U I' or lmm , edia tely at the attachment of the 



fSw to I 6 , C ? are / Ul sectionin g of the entire leaf 



failed to demonstrate the fact. In the work, I have as yet 



node TS e t0 f T 6 satisfactol T actions either through the 

 node 01 through the exact base of the leaf. The point is 

 therefore undetermined, with the probabilities, however, 

 strongly against the view of the bundle being the result of a 

 coalescence of two bundles. 8 



othI h ilT Ce ° ccu P iedb 7 the bundle, as compared with the 

 than i " TT S makm Z U P the Ieaf structure, is smaller 



PinL^L CaSem C ° niferS ' mUCh Smaller than in 



and^PinnT 15 ^' 1 ^ ^ e * bro -r dSCuhlr s / stems « f Taxodium 

 oared In LX ?l N." ***£* **** ° f the other P arts com " 



alent ;; -ZnH SS f^ dltWent iation from the non-equiv- 



ODmen T g elements ; as ^' e11 " * less complete devel- 

 opment of the composing elements (cf. figs. 2 and 4 with fig. 



kif struck • r ° re b ! S fdv conclud ed that, so far Is 

 muclflesTrol ,? n 5 em ? d ' TaX0dium d ^hum presents a 

 ferentHrinr ^°^P lete deve] opment and a much lessperfect dif- 

 ThTfiSTSi- systems than is found in Pinus sylvestris. 



1 Tn h l PP ° rt °V hlS V16W ma y be summarized thus : 

 dencerl hv ^ ?" E ** mechanism of the stomata, evi- 

 Sliehfrno^fir. character of the guard cells, and (b) the 



slight modification ot the subsidiary cells 



ment' oAh^J mpe} '!' eCl - devel °P m ent and indefinite arrange- 

 Tence of 1, r^^u* apparatus, shown by (a), the ab- 

 sclerencl m a T h >T ode ™ d layer, (b) the absence of 

 en£ncel?$tLr T reg !° n ° f the re sin ducc, and (c) the 

 i P ndeLrmin,l n g ' e t Ce - I1S V* gr ° Ups of Cells of this tissue, at 



of support P in mes °P h y 11 ' Arable to no theory 



reJl'arkvnf fnf e ^ ? f a sin ? Ie resin duct ' showing (a) less 

 (cf rn^eric Sffi ^ ^ a ? d ilTe S ular secret ing cells and 



1 P ln thJ i dlf!erentlatlon from the surrounding tissued. 



the less nerfecfd "T^* *»■«»**» of the bundle and 



In ■ ifo - e t h P i Ve °? me i nt ° f the dements imposing it. 



bles thfcondi ton, E S^t' indeed ' Jt more nearh " ^em- 



tne conditions found ,n the young foliage leaf of Pinus 



