178 SPOLIA ZEYLANICA. 
All these coins belong to the same dynasty (the Sung). They 
cover a period of not more than 109 years, or not less than 98 years. 
The date of each is fixed within a very few years. The old Chinese 
eustom of changing the Reign Title sometimes several times during the 
same reign is often confusing, but it is of assistance in fixing a date 
when the precise cyclical year is not mentioned. The sovereigns of 
the present Chinese dynasty do not adopt more than one Reign Title 
for each reign, e.g.,“° Kwang Hsii,”’ Aw. is the Reign Title— 
not the personal name—of the present Emperor, and has been 
so throughout his reign. 
Weihaiwei, R. F.. JOHNSTON. 
October 28, 1906. 

5. Elephants in Ceylon.—It is well known that in Ceylon there 
are two breeds of elephants, the one with tusks and the other with 
tushes. Possibly these extracts from the Mahawansa may throw 
some light on this rather curious fact: “And he (the King of 
Ramajifia) also made a decree that the elephants that many persons 
had sold in his Kingdom for export should not any longer be 
sold. ”—Chapter 76, verse 17. 
‘“ And he likewise put an end to the ancient custom of giving an 
elephant to every ship that bore presents to the King (of Lanka).”— 
Chapter 76, verse 20. 
‘* On another occasion he took the presents and the merchandise 
from the messengers whom the Lord of Lanka had sent in charge 
thereof that they might buy elephants, saying ‘ fourteen elephants 
shall we give you or their value in money.’ But he spake only a 
lie and gave nothing to them.’’—Chapter 76, verse 33. 
‘* And the people of Ramafifia sent yearly many elephants, and 
entered again into a covenant with the Lord of Lanka.’—Chapter 
76, verse 75. 
Ramafifia was in Lower Burma, where, I believe, the elephants 
are tusked. 
JOHN STILL. 

6. Do Butterflies migrate by Night ?—Any one who has watched 
one of the periodical migration flights of butterflies in Ceylon will 
have noticed how the numbers of individuals increase directly with 
the sun’s altitude, so that the idea of a nocturnal migration seems 
at first sight very improbable. The following facts, however, have 
led me to suppose that some butterflies do migrate by night, at 
least occasionally, if not as a general rule. 
a ee 
