451 
of Edinburgh, Session 1870-71. 
The second of Mr Smyth’s cones exhibits from the base to near 
5 112 3 5 
the top a right-handed — spiral (series - , - , - , — , , &c.) 
lo o 4 7 II lo 
with secondary spirals 7 S, 11 D. Near the top of the cone, how- 
ever, two adjacent scales of two of the 7 spirals to the left have 
partially coalesced, and beyond that point the two spirals run 
into one, leaving an arrangement of secondary spirals 6 S, 10 D — 
13 2-3 
a left-handed bijugate of the ordinary series - , - , - , - , &c., 
2 o o o 
3 
with divergence . 
8 = 2 
In the cone of Pinus Lambertiana, recently exhibited to the 
Society, it will be recollected that at the bottom and top of the 
cone there was a left-handed spiral (series \ , p , ~ 
23 4 5 9 14 23, 
&c.) ; while in the middle was a right-handed bijugate of the series 
12 3 5 
- , p, - , , &c., where the divergence in each of the two gene- 
Z o 7 1 Z 
rating spirals = 
In this cone the steepest secondary 
spirals at the bottom and top were 9 D, 14 S ; while those in the 
middle were 10 D, 14 S. 
In connection with the above, Dr Dickson recalled attention to 
the flower-spikes of Banksia occidentalis recently exhibited to the 
Society, where there w T ere four different arrangements, — viz., one 
with secondary spirals 7 and 7 = alternate whorls of 7 (or, if pre- 
ferred, a 7-jugate of the ordinary series with divergence 
2 x 7 ; 
giving 14 vertical rows ; one with secondary spirals 7 and 6 
2 112 
= a spiral (series g > ^ ^ ’ &c), giving 13 vertical rows; one 
5 12 3 5 
with secondary spirals 7 and 5 = a — spiral (series - , - , - , _ 
&c.), giving 12 vertical rows ; and one with secondary spirals 
5 
8 and 5 = a ^ spiral (ordinary series) giving 13 vertical rows. 
It will be noted that, contrary to the opinion of MM. Bravais, 
one arrangement does not necessarily or only originate from 
another by suppression of parts. To prove this, we have only to 
