comoined action ot the winds and waves, and not by the sedi- 

 ment of the dischar^ine,- streams; tliat it is a combination of a 

 <lnft-h,n> (funned by drifting* of sands :»l«,ii«r t he shores t Sin.u-h 

 wmd-made currents), and a K-ar^hti,- (-Made by the waves), and is 

 not a Odto-hir (or one largely due to river detritus). 



Lieutenant Smith reports on the practicability of a Canal across 

 Florida, with reference to a reservoir on the 'smninitdevel. lie 

 cah-ulates. from the mean temperature of Florida (about 7<>°) and 

 the dewpoiut (o5°), by using Dalton's law. that the loss of water 

 by evaporation would be 7"458 inches per month. In connection, 



(Dr. Halley '„ , TJl\ ' (""tte'>. ^ ■','.„" ",'r 



rii'i. i i~ ' . ' i ."W •' s . , i'h 



l,; '7o in. (Hoard of Engineers). The loss from filtration is made 

 to be about fourteen times that from evaporation. lie calculates 

 t' at about one-fourth of the rain-fall can be made available— one- 

 third being the usual allowance, in the more northern States, and 

 40 per cent the result of the experiments of Mr. J. B. Jervis with 

 reference to the Chenango Canal, New York. 



In addition to other sources of supply that of water of infiltra- 

 tion is considered. Lieut. Smith i'ouud. on trials, that water 

 stood in shafts in til sands soil up t< within five t t of th ^n<i.\< 

 during the months of July. August and Sepieinhcr. and into 

 November, except portions of July and August, when it was 

 igher: th it tin sou vl cou d he relied i li u>'_ tlic 

 ■■ inu' months; hut from then until the rains begin in 

 June, the country is too dry for water from this source. It is 



i > available from th> rains, and 

 : - ! ';<'it two-thirds more than tic canal would require. 



The Report contains also the valuable paper of General Wa li- 

 on European Surveys, compiled under the 



rith plates showing style of work: also, 

 r ^ report of Lieut. Wiikki.ek, , M v< wt ' st ot 



[he 100th meridian, a notice of which is d- erred t. nother l um- 

 ber; the Report of Capt. Ludlow, already notice. 1 , on page 22s, 

 besides others. 



'i. H'i'thtof" West Hills;' Lot,', Is!" ■', - W. . 

 that the he! -■ Surrey tor the •■ W - 



383 feet, was .ti.ms that s*et aside entirely the 



doubt expressed on page 235 of this volume.— Eos 



s 

 of Iron and /Steel with reference to the latest Investigations. An 





n of geological 

 and scales of m 



