546 SUMMARY OF CUREENT RESEARCHES RELATING TO 



Stomates of Coniferae.* — Herr 0. Strlibing describes the structure 

 and position of the stomates in 30 genera and 132 species of Coniferae, 

 Juniperus is the only geniis in which the species can be grouped accord- 

 ing to the position of these organs. 



Water-pores in Cotyledons.f— Mr. E. Turnbull describes the distri- 

 bution of the water-pores on the cotyledons of a number of plants. 

 They are usually found on the upper surface of the cotyledon, and 

 when they are present, the upper surface is nearly or entirely destitute 

 of stomates. In several species of Campanula they are crowded on a 

 triangular patch near the apex of the cotyledon distinguished by its 

 smaller epidermal cells ; they resemble the stomates in 'structure, but 

 are smaller. In the cotyledons of ColUnsia grandiflora the water-pores 

 open into large chambers. In those of Urtica pilulifera there is an 

 apical patch of very crowded water-pores on the upper surface. In 

 Polemonium caeruleum there are a few on the under, none on the upper 

 surface. In the cotyledons of Convolvulus major (PJiurhites purpurea) 

 are large cavities surrounded by palisade-parenchyme. 



Tigellum of Trees. J — M, L. Flot describes the structure of the 

 tigellar region of the stem of trees, which he defines thus : — In the plant 

 of one year old the cauline portion may be considered as the equivalent 

 of a branch of the mature tree, developing by the prolongation of a 

 specialized region intermediate between the stem properly so called and 

 the root. This region often includes, besides the morphological tigellum 

 (hypocotyledonary axis), a larger or smaller portion of the epicotyle- 

 donary axis, and appears to proceed from the development of organs 

 already formed in the embryo. This is the tigellar region. 



Bacillar Tumours of the Olive and of Pinus halepensis.§ — M. E, 

 Prillieux states that the olive may often be noticed with bacillar 

 tumours similar to those which have been recently described by M. 

 Vuillemin as growing on Pinus 7ialepensis.\\ The author gives the 

 details of a comparative study which he has made of these tumours, 

 especially from an anatomical point of view. The tubercles of Pinus 

 halepensis present many points of analogy with those of the olive, and 

 their mode of development seems to be the same. The author, however, 

 does not agree with M. Vuillemin when he states his belief that the 

 bacilli penetrate at first to the cambium, and that this meristematic layer 

 becomes the point of departure of ramifying canals, in the interior of 

 which the colonies of bacilli are inclosed. The author has examined 

 many young tumours, and has always found the lacunae to exist in the 

 middle of the parenchyme. The proliferation of the cells round the 

 lacunae is much more active in the pine than in the olive. 



Tubercles on the Roots of Galega officinalis.1" — Prof. F. Delpino 

 has examined the tubercles on the roots of this species of Leguminosas, 

 for the purpose of determining their nature and origin. On first 

 examining them he found the parenchymatous cells filled with the 

 ordinary bacteriiform bodies, in which he detected a slight motion of 

 translation. The specimens were now planted in pure water, and again 



* ' Die Vertheilung d. Spaltoflfnungen b, d. Coniferen,' 8vo, Konigsberg, 1888, 

 76 pp. See Bot. Centralbl., xxxviii. (1889) p. 568. 

 t Ana. of Bot., iii. (1889) pp. 123-9 (5 figs). 



i Comptes Rendus, cviii. (1889) pp. 306-8. § T. c, pp. 219-52. 



II Cf. this Journal, ante, p. 243. *!f Malpighia, ii. (1888) pp. 385-91. 



