I7o HICK: VOLVOX IN YORKSHIRE, 
of V. globator were found, and and vice versa, it is obvious that if 
under any circumstances local predominance is given to one species 
at certain points of the pond, the whole must be carefully examined 
before the character of the pond can be determined. Hence, in 
practice it has been found necessary to fish round the entire pond in 
order to obtain sufficient samples for determining the character of 
the whole. But when all due allowance has been made for this, the 
general result still appears to be as stated, that V. aureus is the 
commoner form in the localities for which Volvox has hitherto been 
recorded. 
Not much was done last year to determine the seasonal duration 
of the sexual and asexual colonies, and there are several anomalies 
which still await elucidation. Thus, in the large supply of V. aureus 
obtained from Salterhebble in July, I found several female colonies 
with a number of oospores varying up to a maximum of eight, but 
no males. One can scarcely believe that these were altogether 
absent, but it is strange that in overhauling some hundreds of 
individuals, not a single male was met with. In contrast with this, 
on this part of the subject there is still much to be done. It has 
too often been assumed that the succession of asexual and sexual 
colonies is simple, definite, and constant, but the researches of Klein 
have shown that this is not the case, and last year’s work has satisfied 
me that the relation between the various colonies is a complicated 
one. ‘The facts on which this view is based are chiefly drawn from 
observations on Lancashire material which cannot be dealt with here, 
but it is mentioned in the hope that those who are favourably situated 
for the purpose will assist in throwing more light on the subject. If 
the succession of forms met with in one and the same pond, with the 
dates of their occurrence, could be once determined, an important 
step would be taken towards unravelling the complicated relations 
under consideration, and would afford a standard of reference for 
other localities. or this purpose it would be necessary to take 
ure an ac 
character of the whole. In en respects, the work would not be 
difficult, seeing that the species are easily distinguishable, and the 
sexual structures so well differentiated that they may be recognised 
under the microscope at a glance. It is hardly necessary to say that 
in cases of doubt, or exceptional difficulty, it would be a pleasure to 
me to give any assistance in my power. 
“Naturalist, 
