3v^6 Nolices respecting Neiv Books. 



will no doubt transfer them into English. For the reduction of 

 his angles the Professor prefers the following formula : 



«C=0 4-tl^i^4^^---Ii^, where C is the deduced 



D sin 1" G SID. 1" 



angle, O the one observed, r the distance between the place of 

 observation and that of reduction; D and G the approximate 

 distance between the two objects observed, the one on the right 

 the other on the left, and between which is comprised the angle 

 O ; lastly, y is the angle of direction, that is the angle of the 

 object on the left with tlie place of reduction." With this for- 

 mula he reduces all his angles, and found between Corollo his 

 first station and Pistoja 33916*23 French toises. From a me- 

 moir read to the Society of Georgqfili, on the 1 1th December, 

 in Florence, it appears that the Tuscan government has ordered 

 the immediate completion of this trigonometrical survey of Tus- 

 cany, which is to be followed by the publication of a new and 

 accurate map of the Grandukedom, and many other improve- 

 ments in the agriculture, irrigation, management of the waters, 

 &;c. in that most interesting province of Italy. At the same 

 time a mineral, geological, and botanical survey of that country 

 is executing by different naturalists of known talents and know- 

 ledge. 



An Essay on the Origin and Operation of the Dry Rot, with a 

 View to its Prevention or Cure ; to which are annexed Sug- 

 gestions on the Cultivation of Forest Trees, and an Abstract 

 of the several Forest Laws from the Reign of Canute to the 

 present Time. By Robert '^l^W \hiA am, Architect and SuT' 

 veyor. 4to. pp. 420. 



The disease which it is the object of this work to aid in pre- 

 venting or curing, has of late become familiar, in its baneful 

 effects, to all who are conversant with building. It has not only 

 become more general than it ever was in former times, but in 

 this country its ravages have increased beyond all proportion to 

 what has taken place in other parts of Europe. It has been 

 reckoned that the annual expense occasioned by the destruction 

 of timber, and the loss of labour in the necessary repairs, has 

 been to government not less than from two to three, and to the 

 wliole nation from four to five millions sterling. 



It is not surprising that under such circumstances the subject 

 should have attracted very general attention, and that many re- 

 medies should have been proposed ; but we agree with the in- 

 genious author of the Essay before us, that even those who have 

 gone furthest into the matter have merely contented themselves 

 with having detected the proximate cause, without endeavouring 



