(2) With very few exceptions, the polyp is not the only type of individual that occurs, but alternates in the life-cycle of a given species, with a distinct type, the medusa, while in other cases the polyp-stage may be absent altogether, so that only medusa-individuals occur in the life-cycle.
In other gallflies and in aphids we find that a sexual generation alternates with one or with many virgin generations.
The plants are admirably adapted for climates in which a season favourable to growth alternates with a hot or dry season;.
Mountain alternates with valley, so that not more than one-eighth of the countrys entire area is cultivable.
And hence I found the required area of the circular segment 2 x3 A x5 il-A to be x - 5 - 7, &c. And in the same manner might be 3 produced the interpolated areas of other curves; as also the area of the hyperbola and the other alternates in this series (1 - (i+xx) 1, (1 --xx) I, &c....
If we put this in the form y=a sin (x - e), we see that y=o, for x =e, e +aX, e+2A, e+;X, and so on, that y is + from x=e to x=e+iX, - from e+zX to e+?A, and so on, and that it alternates between the values+a and - a.
There is some poetry in this composition, but it alternates with very prosaic details.
Ancient myths are admitted without undergoing analysis; the most naïve realism alternates with daring efforts at spiritualizing.
The supreme court is composed of 11 " ministros " or justices, four alternates, a " fiscal " or public prosecutor and the attorneygeneral - all elected by popular vote for a term of six years.
3, 6, 7), alternates direct objections and answers (i.
An outer whorl of five opposite the petals alternates with an inner whorl of five opposite the sepals; at the base of each of the antisepalous stamens is a honey-gland.
Here, intense solar radiation by day, which raises the surface when dry to a temperature approaching 80° F., alternates with severe frost by night.
The northern portion is generally level; the soil is of indifferent quality, strong and marly in a few places, but rocky in all the valleys of the Sierra de Avila; and the climate alternates from severe cold in winter to extreme heat in summer.
In the Marquette district of Michigan (Lake Superior) schistose specular ore occurs in important deposits, associated with a jasper rock, in which the ore alternates with bands of red quartzite.
He alternates between the use of verse and prose; and his hesitancy in choosing a medium of expression is amply justified, for the writer's prose is not more distinguished than his verse.
- The Rumanian climate alternates between extreme cold in winter, when the thermometer may fall to-20° Fahrenheit and extreme heat in summer, when it may rise to ioo° in the shade.