of Salvinia; it is in all probability referable, as in my modified diagram, to type c . Beside it is figured a very different object, a segmenting egg of the Ascidian Pyrosoma , after Korotneff; it may be that this also is to be referred to type c , but I think it is more easily referable to type b . For there is a difference between this diagram and that of Salvinia, in that here apparently, of the pairs of lateral cells, the upper and the lower cell are alternately the larger, while in the diagram of Salvinia the lower lateral cells both appear much larger than the upper ones; and this difference tallies with the appearance produced if we fill in the eight cells according to the type b or the type c . In the segmenting cuttlefish egg, there is again a slight dubiety as to which type it should be referred to, but it is in all probability referable, like Drieschãs Echinus egg, to d . Lastly, I have copied from Roux a curious figure of the egg of Rana esculenta , viewed from the animal pole, which appears to me referable, in all probability, to type g . Of type f , in which the five partitions form a figure with four re-entrant angles, that is to say a figure representing the five sides of a hexagon, I have found no examples among segmenting eggs, and that arrangement in all probability is a very unstable one.
It is obvious enough, without more ado, that these phenomena are in the strictest and completest way common to both plants {380} and animals. In other words they tally with, and they further extend, the general and fundamental conclusions laid down by Schwann, in his Mikroskopische Untersuchungen û¥ber die Uebereinstimmung in der Struktur und dem Wachsthum der Thiere und Pflanzen.
But now