Anatomie. 275 



only by a distinct ovular supply; the welding of the two organs is 

 complete in Juniperus communis and Chamaecyparis Lawsoniana. 



Fusion of bract and scale vascular supplies does not directly 

 parallel fusion of bract and scale. 



Separate origin of bract and scale vascular supplies occurs most 

 generally in the Podocarpineae and Abietineae] fusion of bract and 

 scale supplies has reached its highest expression in the Araucari- 

 neae\ both types of bündle origin are represenled in the same stro- 

 bilus in Cvyptomeria japonica, Cupressus Bentham,ii, and the lower 

 sporophylls of Pinus. 



The bract bündle in plants with uninerved vegetative leaves 

 divides only slightly if at all; the extent of the scale bündle System 

 is directly related to the size of the organ supplied. 



The scale bundles in the Abietineae and Chamaecyparis Law- 

 soniana form in the expanded portion of the organ a straight row 

 or arc; in members of the Taxodineae and Cupressineae scale bund- 

 les Swing around so as to lie at each side of the bract bündle. 



In Cryptomeria japonica and Cupressus Benthamii and perhaps 

 Cunninghamia Davidiana scale bundles accompany the bract bündle 

 into the free portion of the bract. 



A branching bündle in the vegetative leaf in Araucaria and 

 Agathis probably implies a branching bündle in the bract of the 

 sporophyll; the vascular System in the megasporophyll is probably 

 a complex of bract and scale bundles. 



In species of Podocarpus the scalerbundles continue in the por- 

 tion of the scale folded toward the do sal side, forming the epima- 

 tium of the ovule. Jongmans. 



Arber, A. , On the Occurrence of Intrafascicular Cam- 

 bium in Monocotyledons. (Ann. Bot. XXXI. p. 41—45. 3 text- 

 figs. 1917.) 

 In this paper the literature on intrafascicular cambium in Mo- 

 nocotyledons is briefly review^ed, and it is recorded that, in addition 

 to the cases already known, cambial activity occurs in the bundles 

 of the young inflorescence axes of Eremurus himalaicus and Notho- 

 scordum fragrans while an ephemeral cambium occurs in the young 

 shoots of Asparagus officinalis. The case of Eremurus himalaicus is 

 figured. The fact that cambial activity in Monocotyledons is, actually, 

 more vs^iderspread than is generally assumed, offers a slight addi- 

 tional confirmation of the view, already expressed by Andersson, 

 Queva, Chrysler and Sargant, that the existence of this vesti- 

 gial, intrafascicular cambium indicates that Monocotyledons have 

 been derived from a dicotyledonous stock. 



Agnes Arber (Cambridge). 



Bailey,.!. W. and H. B. Shepard. Sanio's laws for the Va- 

 riation in size of coniferous tracheids. (The Bot. Gazette. 

 LX. p. 66-71. 1 Fig. 1915.) 



The writers had occasion to test the validity of the first two of 

 the laws, deduced by Sanio from his observations and measure- 

 ments of the tracheids of Pinus silvestris L. The results of their 

 measurements, undertaken with five conifers, are not in accord 

 with Sanio's first law, since no constant tracheid length was found 

 in any of the specimens examined. Therefore it is evident that 



