Annual report of the Secretary of the State Board of Agriculture of the State of Michigan .. (1862-) (18746259703)

Title: Annual report of the Secretary of the State Board of Agriculture of the State of Michigan ..

Identifier: annualreportofse62mich (find matches)

Year: 1862- (1860s)

Authors: Michigan. State Board of Agriculture; Michigan State College. Agricultural Experiment Station

Subjects: Agriculture -- Michigan

Publisher: Lansing : The Board

Contributing Library: New York Botanical Garden, LuEsther T. Mertz Library

Digitizing Sponsor: The LuEsther T Mertz Library, the New York Botanical Garden

Text Appearing Before Image:

433 STATE BOARD OF AGRICULTURE one of them, the nature of the organism would be difficult to determine. The organisms hold quite tenaciously to the haematoxylin stain, and if the sections are mordanted for 6-8 hours in the iron-alum solution, after pro- longed destaining they still will be stained deeply while all color will be re- moved from plant structures except the nucleoli and chromatin. They are not so numerous nor do they occur in an unbroken succession of cells as was often found to be the case with the bean flagellates. They seem rather to occur in "nests," that is, at a certain place in the stem or petiole they will be quite numerous, then for a short distance they will not be found Several individuals may lie in one sieve tube, then for the distance of several cells none will be present. They have been found, however, in all parts of the stem and petiole from which sections have been cut.

Text Appearing After Image:

Fig. 10. Photomicrograph of a sieve tube in a mosaic tomato plant showing a small trypanosome passing- through a perforation in the sieve plate. X 1500. A. Sieve plate. B. Trjpanosome. Fig. 11 shows the typical trypaniform nature of the organisms as they are found in the sieve tubes, while a broader type is seen in Fig. 12. An occa- sional colony of very small individuals has been seen, the most interesting case being where about eight apparently young individuals werejound lying very close to a sieve plate. Division of some larger form or repeated division of the smaller type had apparently produced the increased number. The location of these very small individuals close to the sieve plates is correlated with migration from cell to cell. These small forms have been seen passing through the perforations in the sieve plates. In Fig. 10 is shown one of these small organisms half way through one of these holes in the sieve plate. The only type of division observed was b) fission. Ijongitudinal binary fission

Jahresbericht des Sekretärs des State Board of Agriculture des Staates Michigan 1862 Buchillustrationen Botanischer Garten von New York Botanik botanische Illustrationen Bilder aus dem Internetarchiv

1862

New York Botanical Garden

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