The manoeuvre involves maintenance of flexion of the emerging fetal head by exerting pressure on the occiput with one hand towards the perineum and thereby preventing extension until crowning has occurred.
It is still uncertain to what extent species identity and stand structural traits drive mixing effects such as overyielding, crown extension, or overdensity.
It is known that stem diameter scales well with crown extension and thus light competition and that these relations are very species specific, at least for conifers, which might affect the relationship.
harvest gaps had, on average, the minimum number of saplings (∼2 stems m−2) needed to fill dominant positions in small canopy openings, but, by year 12, small gaps were closed by crown extension of mature edge trees.
The concession's legitimacy was now safeguarded by the charter and, by extension, the British Crown, making it practically unassailable.
Early American colonists inherited from England a tradition in which the courts, like the legislature, were extensions of the crown.
The bed has "a metal headpiece of wire extensions forming a crown of rays that ends in small metal balls, the entire structure being supported by a series of superimposed metal circles".
For a given tree, the end-points of the crown extensions were connected with straight lines to form a six-sided polygon and the six triangles therein were summed to estimate the crown cross-sectional area (m2).
Lateral tree crown extensions were estimated for each sampled tree by moving along each of the six bearings measuring the distance at which the overhead crown edge was perpendicular to the ground.
The constitution changed the bicameral legislature to a unicameral body and replaced the governor-general (who had been an extension of the British crown) with a president as head of state.
This suggests that madtsoiids, and by extension the ancestor of crown snakes, likely also retained tiny hindlimbs with ankles and toes, as in stem snakes and simoliophiids – unlike any extant snakes.
