232 
The Queensland Naturalist. 
VOL. I. 
although possibly unable to reduce or increase the rate of 
these vibrations, is able, as shown below, to so regulate their 
number as to make notes of different lengths. 
If it Avere possible to strike a succession of a natural 
hemisemidemisemiquavers on the key-board of a piano 
at Allegro time, the effect Avould be a continuous vibratory 
sound : Avhich, Avhilst corresponding to the altitude of the 
insect’s full-cry Avould hoAvever necessarily lack its resonant 
ringing cpiality of tone. 
It is more than probable that in addition to its usual 
song or call it has other notes, perhaps used when in com- 
pany with the female. Bennet says, it cries : — awo’ck, 
awo’ck, aAvo’ck — uttered three times in rapid succession 
like the note of a bird.” 
The duration of its call song is naturally influenced 
by varying conditions not al\Aays easily determinable, but 
under favourable circumstances is sustained for at least five 
minuter, and ceases either abruptly, or by quickly dropping 
for a feAv seconds to the loAver quaver notes Avith which it 
started. 
It AAmuld be interesting to folloAv up this subject A\dth a 
vieAv of obtaining more complete information, but to do so 
seems almost like Avasting time Avhen one recollects the 
vastness of our field for scientific research, and that the 
transformations of many common species of butterflies 
and moths, etc., are still undescribed. 
NOTES ON THE GEOLOGY OF ROSEWOOD. 
Bij Sydney B. J. Skertchly. 
The main geological features of the RoseAvood district 
are as charmingly simple as they are interesting. But 
you must look doAvn upon RoseAvood before you can look 
up to it, and it is built or stuck upon a flat of such tenacious 
clay, yet of such lubricating potentiality, that in wet Aveacher 
(such as favo tired us pare of the time) you either adhere 
