3 oo NATURAL SCIENCE. Oct., 1893. 



quarters. Verona, Broussa, Smyrna, Odessa, the Dobrudscha, have all 

 during the last half-century been visited for one summer by tens of 

 thousands, who are attracted by the visitations of locusts, on which they 

 feed, rear their young, and go. These irruptions, however, cannot be 

 classed under the laws of ordinary migration. Not less inexplicable 

 are such migrations as those of the African darter, which, though 

 never yet observed to the north of the African lakes, contrives to pass, 

 every spring, unobserved to the lake of Antioch in North Syria, where 

 I found a large colony rearing their young, which, so soon as their 

 progeny was able to fly, disappeared to the south-east as suddenly as 

 they had arrived." 



The Perfection of the Human Frame. 



The last of the addresses requiring notice, that of Dr. Munro to 

 the Anthropological Section, will scarcely bear abstracting. It dis- 

 cusses, in an interesting manner, the direct and collateral advantages 

 conferred on man by the erect position of his frame; and there are 

 some noteworthy remarks on the theory of Natural Selection as 

 applied to man. Dr. Munro asks Dr. A. R. Wallace to explain why, 

 in his philosophy, he dispenses with the operation of a " higher 

 intelligence " in the early stages of man's evolution, and finds its 

 assistance only requisite to give the final touches to humanity. We 

 shall be interested to learn the reply. 



