46 JOURNAL AND PROCEEDINGS. 
habitants of Jupiter. A speck, a mere dim speck might be 
seen once every six months a couple of hours before daybreak, 
but nothing to awaken their suspicions that there is here an ac- 
tive world of human beings, a great British Empire, much less 
that there is a Hamilton Astronomical Society giving attention 
to Jupiter. 
Now that we have reached Jupiter, or rather brought it to 
us, many’ questions awaken in our minds. What is Jupiter’s 
physical make-un?. Is it inhabited? Is there life there and 
what life? 
The scientist has done a great deal to answer those ques- 
tions, and some are answered accurately. They have weighed 
Jupiter. It weighs 316 times more than the Earth. Then 
you will ask me how much the Earth weighs and how can it be 
weighed. Well. weigh a yard of earth, granite and mineral, 
and knowing how thick and vast the Earth’s crust it, you can 
soon figure the number of yards. This you multiply by the 
weight of one yard. Then with the theory that the remaining 
globe of the Earth is boiling liquid, which weighs so many 
times less than the solid crust, vou can compute the weight of 
the whole Earth. 
Jupiter is known in its volume. Then its satellites or 
moon that revolve around it, as well as other bodies coming 
into the range of Jupiter’s attraction, scientists have been able 
to determine the power of its attraction by the deflection it 
causes in the course of those bodies. Knowing the volume of 
Jupiter and its power of attraction, it is easy for the scientist 
to reckon its weight; 316 times heavier than the Earth. But 
we saw that it was nearly 1,200 times larger. Then why 
should it not be 1,300 times heavier? This brings to us its 
physical make-up. Jupiter is vet in a fluid state and gives 
forth intense heat, then 316 not 1,300, which would suppose it 
to be solid. 
When seen through the telescope Jupiter presents large 
clouds or belts running from east to west and parallel with its 
equator. When examined closely those belts are found to be 
in foment and terribly agitated. This enables us to make 
many discoveries on Jupiter. [Lantern. | 
