| View Larger Image | The Origin and Development of the Embryo-sac of Salvia Splendens | Paperbackby Anna Livingston Burton (Author)
| List Price: | $16.00 | | | Available: | Usually ships in 24 hours |
| | Binding: | Paperback | | Publisher: | General Books LLC | | Page Count: | 48 Pages | | Publication Date: | August 04, 2009 |
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Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: MATERIAL AND METHODS. The material was collected, for the most part, at Forest Hill Nursery, Lladison, during the fall of 1911, from the last of September until about the middle of October. The material at various stages was fixed in each of the three Flemming's solutions. All older ovaries were first separated from the calyx. The usual method of hardening, embedding and sectioning was employed; the sections were cut five microns in thickness, and stained with Flensing's triple stain. Satisfactory preparations were obtained from material fixed in each of the three solutions used. It is difficult to say which gave the best results. Although Salvia sple'ndens is a garden plant of wide distribution, it is a native of Brazil. This may account, in part, for the large proportion of imperfect embryo-sacs formed in the later stage of development in plants grown under our climatic conditions. OBSERVATIONS. The ovary of Sa'lvir splndens is deeply four- parted and one ovule is formed within each part. The ovule in an early stage (Fig. 1, PI. I) is composed of cells of different shapes arid sizes bounded by a layer of very regular epidern.al cells, excepting at the base of the ovule at the side next the main stem; here there is the beginning of two rows of closely packed, large, irregular, epidermal cells. The nucellar celln just bener.th have divided into two rows of closely packed cells. This condition of the epidermal and nucellar cells indicates the beginning of the integument. So far as this section shows, it has begun to develop on but one side of the ovule. The ovule is orthotropous in form at this early stage (Pig. la, PI. I). Before the microspores have divided, the i;.epa- spoaemother cell (Fig. 2, PI. I) can "be seen as a large, sub-epidermal cell in t... |
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