18 Transactions of the South African Philosophical Society. 

 Travelling west along the parallel of 33° S., the variations are — 



X 95°5 Jan. 10 



VII 77°1 Jan. 29 



VI. E 66°-l Feb. 9 



VI. W 19°-3 Mar. 28 



But now we notice a remarkable fact. We have seen that the 

 epochs come later as we travel east ; they also come later as we 

 travel northwards in the eastern districts ; they also come later as we 

 travel southwards in the western districts. Section XIII. is later 

 than Section XII. ; Section XIV. is later than Section X. But 

 Section III. is earlier than Section I. ; and Section IX. W., is 

 •earlier than Section VIII. W. It follows that the epoch of the 

 "first harmonic term is describing a curved orbit (if such a term may 

 be permitted) with its concavity to the south. There is, for example, 

 the following order : — 



Area. V x . Epoch of Maximum. 



Section XV 101°-5 Jan. 4 



XII 95°-8 Jan. 10 



XIII 85°-8 Jan. 19 



XIV 77°-l Jan. 29 



IX. E 67°-4 Feb. 7 



IX. W 54°-5 Feb. 20 



VIII. W 44°-l Mar. 3 



VI. W 19°-3 Mar. 28 



V. W 6°5 April 10 



IV. W 329°-2 May 18 



Fitting in with the same scheme are Sections X., VII., VIII. E., 

 •and Sections IV. E., V. E., VI. E., whose epochs come in corre- 

 sponding sequence. 



A similar line of inquiry with regard to the epoch of the second 

 harmonic term shows either that the orbit is more complex, or that 

 the monthly averages are not sufficiently near perfection to furnish 

 the desired information. A general view seems to indicate that the 

 path takes a direction from N.N.E. to S.S.W. across the tableland, 

 curving eastward as it nears the south coast. The following are 

 specimens : — 



Area. V 2 . Epoch of Maximum. 



Section XIII. 45°1 Feb. 7 Aug. 9 



XI 23°9 Feb. 18 Aug. 19 



X 313°-3 . Mar. 26 Sept. 24 



