738 | General Notes. [ October, 
this table, we obtain the total duration of exposure to a hatching 
temperature of 60° F., or the total progress that the egg has 
made toward the full complement of 1440 hours required for 
hatching according to the results of section I. 
For example, eggs laid so late as the 1st of September, 1875, 
at the respective stations, would have made progress and would 
hatch about as follows : 
| | Eggs laid September 1, 1875 Average dates 
Station., ‘Latitude. of hatching 
A Will h À Wili hatch PT Locust 
k P ; Plague 
Fort Garry . 50° 1264 hours of temperat’e 60° by June 30); Early in July, 1876 June 
Breckenridge} 46.5 [1410 s e ae une 30| “ 5 “ |3d week in May 
Yankton. . 2.5 140 sy = ae a gy une ‘ Middie May 
North Platte| 41.5 |1434 08 re y April 30| ‘* mae | First of May 
Dodge City . 5 [1404 j “36 ae Nov. 30| During Dec , 1875 April 
Corsicana, . a9 1320 “p hy y Oct. 311“ Nov, E | March 
This table agrees roughly with the dates published in Riley's 
Locust Plague, p. 97, but is here given only as a sample of what 
should be possible when we have a better determination of the 
heat of incubation and have actual observations of the tempera- 
ture of the soil. In such case we should week by week, as the - 
season advances, make up a statement of the actual progress of 
the eggs towards the completion of their period of incubation, 
thus giving the husbandman abundant warning of the birth of the 
young insect, and giving him more precise data by which to 
determine, in any case, the best date to plant or sow in order to 
avoid the ravages of the pests.—Cleveland Abbe. : 
Forster’s TERN IN FLORIDA.—Forster’s terns (Sterna forsteri 
Nutt.) were quite common here for two months, November an 
December, 1879. One specimen was secured. Mr. J. A. Allen 
(On Mammals and Birds of East Florida) says, “I have no evi- 
dence of its occurrence here at this season.” — Thomas W. Wilson, 
Seville, Volusia Co., Fla. 
first of March the weather was warm and spring-like, but after 
_ that it became so cold that the pools were coated with ice several 
: Another peculiarity of this season was the excessive drought 
in May, which dried up several of the pools. Since then the 
rains have filled them again, but the salamanders have disap- 
