130 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



bullate, 3-6 inches long, 2-5 inches wide ; inflorescence paniculate, 

 nutlets orbicular, bright red, \ inch across. — G. H. 



Ribes, Robsonia Section. By D. Bois (Bev. Hort. Jan. 16, 1908, 

 pp. 29-32 ; 9 figs.). — A very interesting article on these flowering shrubs, 

 am bracing a review of monograph, Monographic des Enseilliers, by 

 Ed. do Lanczewski, Geneva. — C. T. D. 



Rosa Willmottiae. By W. B. Hemsley (Bot. Mag. tab. 8186).— 



Nat. ord. Rosaccae, tribe Boseac. China. Shrub densely branched, 

 5-10 feet high, prickles in pairs ; flowers rose-purple, 1-1£ inches 

 diameter.— G. H. 



Rusts, Heteroecious, of Connecticut, having" a Peridermium 

 for their Aecidial Stage. By G. P. Clinton, Sc.D. (U.S.A. Agr. 



Exp. Stn. Connecticut, Report, 1907 ; 5 plates.) — After a description 

 of the general character of heteroecious rusts, this report proceeds 

 to the discussion of Connecticut species, of which thirteen are dealt 

 with, in addition to eight not yet known in the State. — M. C. G. 



Sarracenia, Observations on. By J. M. Macfarlane (Jour. Bot. 

 529, pp. 1-7; 1/1907). — A history of the generic name, dedicated to 

 Dr. D. Sarrasin, of Quebec, and of S. Catesbaci, S. Drummondii, and 

 S. minor; but it appears (Jour. Bot. 531, pp. 117-118) that Sarrasin's 

 name was Michel. — G. S. B. 



Saxifraga Brunoniana. By W. Watson (Bot. Mag. tab. 8189).— 



Nat. ord. Saxifragaceae, tribe Saxifrageae. India. Perennial herb ; 

 stems with runners, slender, red ; flowers golden-yellow. — G. H. 



Saxifraga Grisebachii. By B. Othmer (Die Gart. No. 40, 

 p. 409 ; July 4, 1908). — Discovered in 1902. A native of Albania and 

 Macedonia at about 1,500 to 2,000 metres alt. The leaves form a 

 perfectly symmetrical rosette, but the greater attraction lies in the bright 

 purple bracts of the inflorescence. — G. R. 



Sieve-Tubes of Ang-iosperms, The History of the. By A. W. 



Hill (Ann. Bot. vol. xxii. April 1908, pp. 245-285; 2 plates).— The 

 latest communication by the author on the histology of the sieve-tube 

 deals with Vitis vinifcra, Wistaria chincnsis, Cucurbita Pepo, Tilia 

 vulgaris, Viscum album, Phascolus vulgaris, and P. multiflorus. 



In Wistaria chincnsis and Cucurbita Pepo the pit-closing membranes 

 are crossed by small groups of fine protoplasmic threads, whilst in 

 Vitis vinifcra there is apparently only one. Each pit is ultimately 

 occupied by a single slime string which has arisen by ferment action 

 from the original thread or threads. For details the original must be 

 consulted. 



The following explanation is given of the remarkable changes that 

 take place in the phloem elements. In the sieve-tubes there is the need 

 of the format ion of definite holes for the translocation of material, and 

 the connecting thremls serve as useful paths along which to work |n 



