THE PROGRESS OF SCIENCE 



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AT TI.K Begixxixg and Exd of the Xixeteexth Cextuky. 



and will be tripled in Great Britain. 

 It should also be remembered that the 

 death rate of those over 4.1 has in- 

 creased continually, owing mainly to 

 the keeping alive of weakly people at 

 eai lier ages. 



It seems unlikely that the death rate 

 will ever be considerably smaller than 

 it now is in England, whereas the con- 

 ditions which have lowered the birth 

 rate seem destined not only to continue 

 but to increase. The physiological lim- 

 itations will doubtless increase as chil- 

 dren grow up who could not be born 

 naturally or be nursed naturally or live 

 through the harsher conditions that 

 formerly obtained. The economic and 

 social causes — the increase and wider 

 diffusion of wealth, prudence and 

 knowledge — will almost surely become 

 more potent. 



Dr. Bertillon discusses in detail the 

 causes of the depopulation of France 

 and the measures which he recommends 

 to arrest it. The latter are indeed 

 feeble in comparison with the former, 

 and he puts on his title page the pessi- 

 mistic motto "11 11 'est pas besoin 



VOL. lxxix- 42. 



d'esperer pour entrependre ni de reus- 

 sir pour perseverer. ' ' Apart from a 

 moral regeneration leading people to 

 want to do what they can rather than 

 to get what they can, the remedy is in 

 the direction recommended in the book, 

 but requires far more radical measures. 

 Children are no longer a financial asset 

 to their parents, but they are this to 

 ' the state and to the world ; the state 

 must ultimately pay for their birth and. 

 rearing. 



THE ZOOLOGICAL LABORATORY 



OF THE UNIVERSITY OF 



PENNSYLVANIA 



Four of the leading eastern univer- 

 sities — Pennsylvania, Johns Hopkins, 

 Princeton and Yale — have provided 

 new laboratories for their departments 

 01 zoology. At the Johns Hopkins the 

 laboratory is part of buildings planned 

 for the whole university on its removal 

 to a new site. At Princeton great 

 buildings have been erected for the 

 natural sciences and for physics, and 

 similar buildings are in course of erec- 

 tion for Yale. The new building at the 



