THE SEGREGATES OF SPERGULA ARVENSIS L. 178 
bearer 9 opposite to one another, and one or the other has to bend 
order that they meet; and this curvature appears to be the 
saotlt of the chemical excitation of a substance exuded from the 
extremities of the tu 
est adds re testimony that, in a very large number of 
cases examined, he never came across an instance of “ cross- 
jug 
; f not myself es any doubt that, even in lateral con- 
jugation, there is an ent differentiation of sex, though this 
differentiation extends conte as far as the individual cells. It does 
THE SEGREGATES OF SPERGULA ARVENSIS L, 
By G. CrarmcE Drvce, M-A.,-F:3..8; 
In this Journal ge 1880, Sie 16-19, Mr. Nicholson m published 
an interesting paper on the fi of Spergula arvensis, which first 
drew my attention to the sukjest'] Sino> that time I have examined 
many hundreds of specimens, and the results of the examination 
quite bear out Mr. Nicholson’s statements. Some of the following 
observations have been already made in Mr. ra ais 8 paper, but 
I may — Sou for again calling attention to the 
rv l. Crit. Cent. vi. pp. 10, 11, Recakmabeat; describes the 
two nies 8. sativa and S. vulgaris, into which Boenninghausen, 
in Prodr. Fl. Monasteri. p. 185 (1824), had divided the Linnean 
iain ula arvensis, and identifies S. sativa Boenn. with S. arvensis of 
the —- Plantarum. He says of S. sativa :-—‘ Petalis subrotundis, 
says :—‘‘Petalis oblongis, seminum papillis clavatis 
erectis,”’ and refers to Flora Danica t. 1033. Hartman, (2 
co 
When pkg oe sandy soil, S. sativa may bediohageeten 
