Home > Science & Mathematics > Physics > Classical mechanics > Revue Des Cours Scientifiques de la France Et de l'�tranger, 1868-1869, Vol. 6: College de France, Museum d'Histoire Naturelle, Sorbonne, �cole de Pharmacie, Facult� de M�decine, Soci�t�s Savantes, Facult�s Des D�partements, Univers: College de France, Museum d'Histoire Naturelle, Sorbonne, �cole de Pharmacie, Facult� de M�decine, Soci�t�s Savantes, Facult�s Des D�p
Revue Des Cours Scientifiques de la France Et de l'�tranger, 1868-1869, Vol. 6: College de France, Museum d'Histoire Naturelle, Sorbonne, �cole de Pharmacie, Facult� de M�decine, Soci�t�s Savantes, Facult�s Des D�partements, Univers: College de France, Museum d'Histoire Naturelle, Sorbonne, �cole de Pharmacie, Facult� de M�decine, Soci�t�s Savantes, Facult�s Des D�p

Revue Des Cours Scientifiques de la France Et de l'�tranger, 1868-1869, Vol. 6: College de France, Museum d'Histoire Naturelle, Sorbonne, �cole de Pharmacie, Facult� de M�decine, Soci�t�s Savantes, Facult�s Des D�partements, Univers: College de France, Museum d'Histoire Naturelle, Sorbonne, �cole de Pharmacie, Facult� de M�decine, Soci�t�s Savantes, Facult�s Des D�p

          
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Excerpt from Revue des Cours Scientifiques de la France Et de l'�tranger, 1868-1869, Vol. 6: College de France, Museum d'Histoire Naturelle, Sorbonne, �cole de Pharmacie, Facult� de M�decine, Soci�t�s Savantes, Facult�s des D�partements, Universit�s �trang�res, Soir�es Scientifiques de la Sorbonne Et des Villes de Province, Conferences Libres

Une d�viation de la tendance caract�ristique se montre chez quelques L�gumineuses et s'accompagne de singuli�res par ticularit�s d'organisation, surtout chez le Vicia amphicarpa, dont M. J.-h. Fabre a fait une �tude attentive. A sa germina tion, cette plante produit une tige qui ne d�passe gu�re un d�cim�tre de hauteur, et qui, une fois d�velopp�e, �met des rameaux au niveau du sol, puis se dess�che. Ces rameaux sont de deux sortes les uns s'�l�vent dans l'air, charg�s de feuilles et de fleurs normales, n'offrent donc rien de particu lier; eu contraire, les autres naissent, pour la plupart, de la base des premiers, par cons�quent plus tard que ceux-ci; ils s'�tendent dans la terre, et ils restent blancs, irr�guliers, un peu tortueux; ils portent des feuilles tr�s - petites, mais bien conform�es, et, vers leur extr�mit�, deux ou trois fleurs exil laires que leur situation souterraine retient dans un �tat de d�veloppement assez imparfait, la corolle y restant cach�e � l'int�rieur d'un calice qui ne s'ouvre point. Toutefois, contrai rement � ce qu'avaient dit plusieurs botanistes, ces fleurs souterraines ont leurs organes reproducteurs bien conform�s, et la f�condation de leur pistil s'op�re sous terre, de mani�re � donner naissance � de bonnes graines. L'exp�rience a prouv� a M. Fabre qu'en amenant � l'air et au jour ces rameaux hy pog�s, on d�termine le d�veloppement normal de leurs peti tes fleurs, et que r�ciproquement, si l'on enterre les rameaux destin�s � rester a�riens, on oblige leurs fleurs � rester dans l'�tat qui caract�rise celles dont la situation naturelle est sou termine.

Une autre particularit� remarquable constat�e par M. Fa bre, c'est que de la base des principaux rameaux a�riens du Vicia amphicarpa naissent des ramifications plus petites et plus faibles, dont quelques - unes vont s'enfoncer dans le sol et sont d�s lors priv�es de la tendance � s'�lever qui caract� rise les tiges en g�n�ral. On voit �galement cette tendance normale abolie chez d'autres plantes, en particulier dans quelques L�gumineuse3 qu'on pourrait appeler enterreuses, car, apr�s avoir fleuri l'air, elles recourbent plus ou moins brusquement leur p�doncule pour enfoncer leur ovaire f� cond� dans la terre o� il doit se d�velopper en fruit parfait. Ces faits curieux au plus haut degr� semblent bien difficiles � faire cadrer avec les hypoth�ses bas�es sur une action m�ca nique, par lesquelles on a essay� d'expliquer les directions naturelles des organes.

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Product Details
  • ISBN-13: 9780265726198
  • Publisher: Forgotten Books
  • Publisher Imprint: Forgotten Books
  • Language: French
  • ISBN-10: 0265726190
  • Publisher Date: 29 Apr 2018
  • Binding: Paperback


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Revue Des Cours Scientifiques de la France Et de l'�tranger, 1868-1869, Vol. 6: College de France, Museum d'Histoire Naturelle, Sorbonne, �cole de Pharmacie, Facult� de M�decine, Soci�t�s Savantes, Facult�s Des D�partements, Univers: College de France, Museum d'Histoire Naturelle, Sorbonne, �cole de Pharmacie, Facult� de M�decine, Soci�t�s Savantes, Facult�s Des D�p
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Revue Des Cours Scientifiques de la France Et de l'�tranger, 1868-1869, Vol. 6: College de France, Museum d'Histoire Naturelle, Sorbonne, �cole de Pharmacie, Facult� de M�decine, Soci�t�s Savantes, Facult�s Des D�partements, Univers: College de France, Museum d'Histoire Naturelle, Sorbonne, �cole de Pharmacie, Facult� de M�decine, Soci�t�s Savantes, Facult�s Des D�p
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Revue Des Cours Scientifiques de la France Et de l'�tranger, 1868-1869, Vol. 6: College de France, Museum d'Histoire Naturelle, Sorbonne, �cole de Pharmacie, Facult� de M�decine, Soci�t�s Savantes, Facult�s Des D�partements, Univers: College de France, Museum d'Histoire Naturelle, Sorbonne, �cole de Pharmacie, Facult� de M�decine, Soci�t�s Savantes, Facult�s Des D�p

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