Application of the Altmann Freezing-Drying Technique to Plant Cytology

Iv.—the Structure of the Chromosome.*

“…Nebel and Ruttle (1937) find the * Also Gates and Mensinkai, 1938. same in Dissosteira, except that, as already mentioned, the leptotene thread is found to be so delicate that only its primary resolution into two strands can be observed. Goodspeed, Uber, and Avery (1935) find similar conditions in Lilium by using the Altmann freezing-drying technique. These results taken together, and supported by photomicrographs, yield evidence which may be difficult to controvert, although the weight of evidence is against them.…”

Chromosome Structure XI

“…The observation of such early workers as Merriman (1904, on Allium), Bonnevie (1908, fi gs. from Ascaris) and others and the findings of such later workers as Goodspeed, Uber and Avery (1935), Stebbins (1935), Sax and Sax (1935), Huskins andSmith (1934, and and others are in part corroborative.…”

Chromosome Structure. Ix. Tradescantia Reflexa and Trillium Erectum

“…The classical observations of Merriman (1904, in Allium), Bonnevie (1908, on Ascaris, referring to the drawings only), and Taylor (1922, on Gasteria) all support the quadripartite structure of the somatic chromosome. The senior author's earlier accounts (1932, 1933a, 1933b) of the history of the chromonematic threads through mitosis of Tradescantia have been corroborated by Goodspeed, Uber, and Avery (1935), working on Lilium longiflorum with fixation by liquid air and microincineration. They, in addition, for the first time observed eight threads in somatic metaphase chromosomes.…”