. Lezioni biologici consegnati al laboratorio biologico marino di legno Holl [sic]. Biologia. 146 Lezioni biologica. il polo vegetativo o a metà strada tra questi poli sul lato che zvas 2ipperniost. Come per la stessa blastodisk, tJiat mantenuto la sua posizione presso la libera polo dell'uovo, vicino al inicropyie, in posizione ivJiatever uova zuere posto. La posizione delle uova è stata tracciata nel caso di dieci uova fissate in posizione capovolta. La coincidenza del primo solco con l'asse embrionale è stato osservato in tre dei dieci casi (Fig. IV). Il terzo esperimento è stato realizzato

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. Biological lectures delivered at the Marine Biological Laboratory of Wood's Holl [sic]. Biology. 146 BIOLOGICAL LECTURES. the vegetative pole, or halfway between these poles on the side that zvas 2ipperniost. As for the blastodisk itself, tJiat retained its position at the free pole of the egg, near the inicropyie, in ivJiatever position the eggs zuere placed. The position of the eggs was plotted in the case of ten eggs attached in the inverted position. The coincidence of the first furrow with the embryonic axis was observed in three out of ten cases (Fig. IV). The third experiment was made during the summer of '98. A broken bottle from the eel pond was brought into the labora- tory containing a toadfish and a few eggs which had been already deposited by the fish. On the morning of July 6 the fish was opened and the mature eggs allowed to flow out of the ovaries and fasten them- selves on pieces of glass. About one-third of the eggs set free from the ovaries became fixed to three glass plates. The rest failed to adhere and so were of no use in the experiment. Two minutes was sufficient time to allow for the eggs to become fixed. The plates were then inverted and placed on supports in a large shallow dish with sufficient sea-water to cover them. The eggs were then fertilized, and soon after the water was siphoned off by means of a rubber tube and fresh sea-water. Fig. IV. quickly supplied. The dish was so placed that the eggs could be observed from below. At 4.30 P.M. — eight hours after fertilization—the first line of cleavage was noted in fourteen eggs, and the direction of the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Marine Biological Laboratory (Woods Hole, Mass. ). Boston, Ginn & Co

Parole chiave associate all'immagine

• bookcentury1800
• bookdecade1890
• bookpublishe
• booksubjectbiology