a ae TETEE 
a ee el eee Te pi 
1883.) 
Entomology. ` 549 
feet away, I could not see minute points distinctly. It is prob- 
able that the main struggle occurred before I disturbed them.— 
J.E. Todd, Tabor, Towa. 
Mosguitos vs. Mararia.—Dr. A. F. A. King, dean of the 
Medical Faculty of Columbian University, recently read a paper 
before the Philosophical Society of Washington, D. C., in which 
he endeavored to sustain the thesis that malarial disease is pro- 
duced through the instrumentality of mosquitos, which, by their 
punctures inoculate the body with the malarial poison. 
ile we cannot agree with Dr. King in his conclusions, it is in- 
teresting to note how ingeniously prevailing phenomena connected 
with malaria may be made to apply to the well-known habits of 
the mosquito. Dr. King presented a series of twenty statements 
drawn from the best medical authorities in relation to malaria and 
which he argued would equally apply to mosquitos. They are 
briefly as follows : 
I. Malaria prevails most in moist and low localities. 
2. It is rarely developed at a temperature below 
3. It is checked by a freezing temperature. 
4. It is most virulent towards the equator and along the sea- 
Coast. 
5. It has an affinity for dense foliage. 
6. Forests and woody tracts act, nevertheless, as an obstruction 
to its spread. 
7. Atmospheric currents transport it. ae 
8. It is developed in previously healthy places by digging up 
the soil or making excavations which are apt to be followed by stag- 
nant pools. 
9. Bodies of water in the line of winds that waft it, have the 
Power of arresting it. i 
10. Absence of mosquitos appear to prevent malarial diseases. 
11. Malaria diminishes in proportion as a country becomes 
More thickly settled. 
12. It usually keeps near the surface of the earth. 
13. It is most dangerous after sunset. 
14. Persons are most exposed to it while sleeping. 
15. The white race is the most sensitive to it. 
16, Fire destroys it. 
17. It diminishes towards the center of cities. 
18. It is most prevalent in late summer and autumn, 
19. It is arrested by walls, fences, hills, rows of houses, cur- 
-S OF even gauze-veils or mosquito nets. 
20. It spares infants more frequently than adults. 
_Extomorocicat Nores.—Mr. R. M. Lachlan having recently 
Written on the occurrence of a marine caddis-fly in New id 
fete ee to the genus Philanisus, Dr. Hagen calls attention to the 
thatin +1 ee ges of the sea-fisheries of th couth 
E 
