The works of Francis Maitland Balfour, Volume 1 (of 4)

by Francis M. Balfour

The first groove (gr₁.) extends to No. 3.

The second groove (gr₂.) extends from No. 4 to No. 7.

The third groove (gr₃.) extends from No. 11 to No. 13.

The first ridge (r₁.) extends from No. 2 to No. 5.

The second ridge (r₂.) extends from No. 8 to No. 11.

The third ridge (r₃.) extends from No. 13 backwards through twelve sections, when it terminates by a pointed extremity.

Fig. C. Section through the ridge connecting the second and third grooves of the head-kidney of an embryo slightly younger than that from which Series B was taken. Zeiss C, ocul. 3 (reduced one-third).

The fold of the germinal epithelium, which gives rise to a deep groove (x.) external to the head-kidney is well marked.

Series G. Sections through the rod of cells constituting the termination of the Müllerian duct at a stage in which the head-kidney is still present. Zeiss C, ocul. 2.

Plate 28.