::5 



THE POPULAR SCIE2 ?1 M XTHLY. 



Radobo j in Hun- 

 gary, Monte Baka in Italy, and the Floris- 



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 of insects they afford. 11k 

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 ur-:- :lif jt _ : ; : :: '.;ss 

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 beds is ifii lia ^wi h e il by the prevalence 



types. Eytrae are found in 

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A cnrraJio- 



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Sewire-Inialiwi ia 

 X. Durand-Claye. a 



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 ef of about 



Thus far, four hundred and seventeen ac 

 hare beat enough to absorb all the sew. 

 age of the city, indicating an absorbing- 

 power of thirry.r*-o thousand cubic met 

 a vear for each acre. The works 



the city, for the use of the irrigated lands 



::: tlirrj - :.:- :.:.: :;.-. .:.~1 :s ;u ..:::: 

 gardeners for from : ~ f twenty-eight 

 i- -::e. Hie mortality of the 

 city one of about one hundred thousand 

 inhihil mln Iii~ been reduced twenty-one 

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meats with chemical agents, irrigation i 



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tract took in and purine . 18 cubic me-. 



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iliinmiiMil to treat all of its sewer-waters 



_ .he same way, and bought two tracts, one 



: seventeen hu n dr ed and forty acres, the 



other, at Osdorf and Friederiekenhof , of two 



HmwhimI a: One thousand 



and ei ghty acres of the latter tract only hare 



been used. In addition to the cultivated 



plats, drained basins are provided for the 



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ieh, after a de p osit about a foot thick has 



accumulated, the grout. I ried, dug up, 



i ready for cultivation in the next 



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seats are not affected by them. The cost 



: *ZZ tne ttnds is defrayed by the 



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ifale to let the lands atfromtwer 

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hundred acres, of suck a character tint 1 

 tea drainage is necessary. The irrigated 

 lands are let to the engineer who eonstruet- 

 the works at a scale of rents which 



to rise in four years to eighteen dollars an 



The Salt Depart* of the Persian Galf. 

 On the eastern side of the Persian Gulf 

 is an extensive area containing a fan 

 deposit of salt winch crops out at various 



