BOTANICAL INFORMATION. 183 
the cause of this mischief, for it grows thick among the grass 
of Mr. Singleton’s enclosure, and I have strong reasons for 
believing that the same plant occasions the blindness with 
which sheep and goats are commonly seized, after feeding 
on the rich flats at the head of the Swan and on the Helena 
and Canning Rivers; several of Mr. Singleton’s horses 
having gone blind, before any other dangerous symptoms 
Supervened. I suspect this Ranunculus to have the same 
effects on animals as are produced by cantharides, when 
taken internally, upon the human frame. 
After spending two days with Mr. Singleton, I found an 
opportunity of proceeding to Freemantle by Mr. Oakley’s 
cart, and noticed in this journey those species of phospho- 
rescent Agarics to which I have alluded in my letter. 
J. DRUMMOND. 
Additional Observations on the pollen-collectors of Campanula. 
In reference to his paper on this subject, given at p. 601 
of our First Volume, Mr. Wilson remarks; “I find the same 
Structure in C, ranunculoides, as in C. rotundifolia, except 
that the three branches of the stigma become decidedly revo- 
lute, and thus come into contact with the pollen lodged upon 
the collecting hairs; but this does not occur until after the 
hairs are retracted into their cavities, and consequently long 
after fecundation may be supposed to have taken place. 
1 “The pollen sends out tubes from four points which are 
~ Previously visible as circular disks. The pollen-tubes appear 
t We branched, and much entangled; their diameter not 
More than one fifth of the tubular cells composing the stig- 
matic tissue, and on that account they would be very 
distinguishable if they penetrated that tissue, but I could 
_ ‘Never find any in that part, and still less within the ovarium. 
= On the other hand, I extracted a grain of pollen from one of 
.— We cells of an invaginated hair on the style which exhibited 
traces of four pollen.tubes. : : eee 
