25 
These worms are peculiar in not being able to complete 
their existence in one host. The chance of an egg becoming a 
mature worm is almost infinitesimal, although one worm may 
produce considerably over a million eggs in less than a year. 
Each egg in order to develop must be taken into the system 
of an intermediate host of a definite species, there to develop 
partly and lie quiescent until its host becomes a prey to the 
dog, when its development may be completed. The fact that the 
intermediate. or cystic stage is passed in many animals used for 
human food should be sufficient warning to us to see that the 
meat inspection of our cities is rigidly carried out by really 
competent persons. 
THURSDAY, APRIL 18ru, 1907. 
Garthquakes. 
BY 
Meee ne HORA, B.A., B.Sc. 


! aes lecturer, in opening his address, stated candidly that he 
could not offer the Society any researches of his own on the 
important subject of earthquakes, but as he was addressing a 
distinctly cultured audience he proposed treating it from a 
scientific rather than a popular point of view. As regards the 
historical side, he stated that the earliest records of earthquakes 
were to be found in our Bible, and read passages wherein earth- 
quakes were mentioned, such as Moses receiving the law on 
Sinai, the story of Korah, Dathan and Abiram, the fall of 
Jericho, the terrible earthquake in the reign of Uzziah King of 
Judah, and also the scene during Christ’s crucifixion. The old 
Greek and Latin writers often alluded to the phenomenon and 
even put forward probable theories to explain it, but the modern 
and systematic study of the subject started about the beginning 
of the Nineteenth Century and is connected with the names of 
Professor Alexis Perrey, of Dijon, Mr. Robert Mallet and his son, 
and Professor Milne in England, and Major Dutton and Professor 
See in United States, and great results followed from the work 
of the Seismological Society of Japan, established in 1880. 
A slide was then projected on the screen giving Mallet and 
Milne’s definition of an earthquake as follows :—An earthquake 
is the transit of a wave or waves of elastic compression or 
elastic contortion in any direction from vertically upwards to 
