iu pressing the telegraphic liey whicli registers the appearance and disap- 

 pearance of the meteor. The average of the results obtained for the 

 duration of visibility is 0.6 second. 



In order to secure the parallax of the meteors observations were made 

 at Bloomington and at Bedford. The co-ordinates of these stations are, 

 for Bloomington, longitude 86° 32' 11", latitude 39° 10'; for Bedford, 

 longitude 86° 39' 10", latitude 38° 52'. The distance (rectilinear) between 

 the two stations is 33,652 meters, equaling 20.13 miles. 



An examination of our charts and recorded times showed that of all 

 the meteors platted only one had been observed simultaneously at both 

 stations. 



Using the method of Klinkerfues, we found that the height of the 

 meteor at the time of apparition Avas 143 miles, and its height at the time 

 of its disappearance was 64 miles. 



Mosquitoes and Malaria. 

 By Robert Hessler. 



[Abstract.] 



The recently developed theory that mosquitoes are the carriers of 

 malaria from one man to another, which is based on the definitely 

 ascertained cause of malaria, is a question of considerable importance to 

 inhabitants of malarial districts, such as we have, for instance, along the 

 Wabash Rivei". 



Speaking of Indiana, especially when compared with former times, 

 it may be said that malaria has lost Its terrors. To see what the disease 

 really is requires a visit to such a region as the desolate Roman Cam- 

 pagna, or to the Isthmus of Panama. The ravages of the disease, known 

 about Rome as Pontine fever and at Panama as Chagras fever, is some- 

 thing terrible to contemplate. 



Popularly it is generally believed that the drainage of wet areas and 

 of stagnant waters is the cause for the great diminution in the number of 

 cases and of its severity among us. 



For a cause, biologists and physicians always want something tangible 

 —a something that can be seen, felt, weighed or measured; a something 



