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The Musetim Gazette 



corona show that it varies from eclipse to eclipse. At 

 maximum sun spot periods the corona spreads indifferently 

 all round the sun, but when these periods are at minimum 

 it spreads rather in the direction of the sun's equator. 

 — (Professor H. H. Turner). 



The Interior of the Earth. — " There does exist absolute 

 proof that the earth is a cooling body. The high temperature 

 that has been registered at the bottom of mines and deep springs 

 proves the point beyond all doubt that, as the centre of the 

 earth is approached, the temperature becomes higher. 

 Taking the average of ail the observations, it would appear 

 that the temperature rises i° F. for every 51 feet of the 

 earth's crust penetrated." — (Bereford Ingram in Knowledge^ 

 January, 1906.) 



Tsetse-fly and Sleeping Sickness. — Mr. A. E. Shipley, 

 F.R.S., in his address on n Insects as Carriers of Disease," 

 delivered before the British Association at Pretoria, remarked 

 that Colonel Bruce has shown that the sleeping sickness of 

 Central Africa is conveyed by a species of tsetse- fly (Try- 

 panosoma). In three years in Uganda 100,000 people had 

 been killed by it. The trypanosoma lives in the blood 

 without doing much harm, it sets up the sleeping sickness 

 only when it reaches the cerebro-spinal canal. 



Migration of Fish. — The general facts brought out by 

 Mr. Garstang's experiments are these : " The smaller fishes 

 do not appear to migrate to any considerable extent, and the 

 larger is the fish the more extensive are its migrations. In 

 some cases the distance travelled has been very considerable ; 

 thus one plaice is shown to have travelled a distance of 175 

 miles in about six weeks, and another travelled a distance of 

 210 sea miles in eight months. The general trend of the 

 migrations has been in a southerly direction during the 

 winter, and in a northerly one during th^ summer. As a 



