424 BIBLIOGRAPHY. 



thick fleshy mass traversed by vascular bundles. The embryo is 

 not developed in these prior to the fall of the seed from the fruit. 

 The tubercular seeds are produced by a more or less campylo- 

 tropous ovule destitute of integuments, of vfhich the endosperm 

 forms a fleshy mass vdthout vessels. The embryo develops at an 

 early period, and before the fall of the seed. A detailed account 

 is given of the ovules and seeds of Symenocallis, Amaryllis Bella- 

 donna, and species of Crinum. II. The various conditions in- 

 cluded under the general term Viviparity are enumerated, and 

 the question of the morphological signification of the ovule and 

 its parts discussed. Apropos of the latter subject, the author 

 states the only example known to him of the formation of a 

 foliaceous bud replacing the nucleus in the interior of an ovule. 

 In this case, observed by Schimper, the ovules (of Nigella Dama- 

 seend), although enlarged and elongated, retained their anatropous 

 form and two integuments, of which the inner projected beyond 

 the outer one, which was more or less open. The inner coat pre- 

 sented a micropyle, sometimes very minute, sometimes widened. 

 In the former case, the leafy bud broke through the side of the 

 coat ; in the latter, it projected from the micropyle. Upon one 

 of the small leaflets borne by these ovular buds, M . Schimper found 

 a rudimentary ovule, consisting of a conical nucleus and basal 

 annulus, from which it projected. 



.BRAUisr, A. — TJeber eine Sonderbare "Wirkung der diesjahrigen Spat- 

 froste auf die Blatter der gemeinen Eosskastanie {JEsculus hippo- 

 castanuiii) und einiger anderer Baume. Berlin Monatsb. 1861, 

 691. 



Brononiaet, Ad. — Note sur le Sommeil des Peuilles dans line Plante 

 des Grraminees, le Strepliiurn Guianense. Bull. Soc. Botan. vii. 

 p. 470. 



During ' sleep ' the distichous leaves overlap each other 

 closely, the upper surface of the limb of each being applied 

 against the sheath and lower face of the leaf immediately above. 

 The sleep movement commences long before nightfall, between 

 4 and 6 p.m. in the long days of summer. 



Beongniart, Ad. et A. GtRis. — Observations sur I'Ovule et la 

 Grraine du Posidonia Caulini. Bull. Soc. Botan. vii. p. 472. 



In reference to the debated structure of the seeds, the authors 

 find the 'canal' of elongated cells traversing the interior longi- 

 tudinally to constitute the single vascular bundle of the tigellus 

 of the embryo. The true micropyle is hardly discoverable in the 

 seed, owing to the integuments being usually desti-oyed. The 

 brown spot which may have been taken for such is the point of 

 origin of the radicle, thus corresponding, however, with the micro- 

 pylar extremity. 



Brongniart, Ad. — Observations sur un genre remarquable de Yio- 

 lacees de la NouveUe-Caledonie. Bull. Soc. Bot. 1S61, p. 77. 

 Agatea of Asa Gray (for which name M. Brongniart proposes 



