Transactions of the Boyal Society of South A frica. 
In. 
19-89. 
17- 43 
26-00 
22- 21 
25- 22 
24-60 
23- 94 
22- 78 
24- 59 
26- 93 
19-01 
24-29 
20'21 
18- 22 
19- 43 
23- 34 
23-14 
21- 03 
23-48 
22- 41 
1 
mmmmm%mm% i 
Ft. 
4050 
3970 
4S00 
4350 
4600 
4500 
4950 
4250 
4460 
3800 
3900 
4700 
4200 
4140 
3800 
4870 
4380 
4150 
3940 
ns 
