Analysis of Scientific Books. 395 



Many further details are given in this paper respecting the 

 methods of closing the openings between the timbers, and of 

 preventing the access of air to the enclosed parts, by the in- 

 jection of coal-tar ; and directions are also laid down, upon a 

 variety of subjects, which require reference to the plates, and 

 which we are therefore obliged to omit. 



The great advantages derived from the plan here described 

 are, the attainment of additional strength, decrease in the con- 

 sumption of materials and difficulties of construction, protection 

 from worms externally and vermin internally, and facility in. 

 stopping leaks. 



ii. Upon the diferent Qualities of the Alburnum of Spring and 

 Winter Felled Oak Trees. By Thomas Andrew Knight, 

 Esq., F.R.S. 



The timber of oak trees, felled in winter, has generally been 

 acknowledged as superior in quality to that felled in spring, 

 yet the practice of winter-felling has been given up on account 

 of the greater value of the spring-bark. 



In this paper Mr. Knight proposes to obtain the advantages 

 of both seasons, by taking off the bark in the spring, and suf- 

 fering the tree to stand till the ensuing winter. 



iii. Some Experiments on the Fungi, which comtitute the colouring 

 Matter of the Red Snow discovered in Baffin^ s-Bay, By Francis 

 Bauer, Esq., F.L.S. 



Our readers will recollect that very considerable difference 

 of opinion prevailed respecting the colouring matter of the red 

 snow, discovered in Baffin's-Bay, during the northern expedition 

 under Captain Ross : we believe that Dr. WoUaston first sug- 

 gested their vegetable origin, but it was not until the publication 

 of a very interesting paper upon the subject in this journal 

 (Vol. vii., p. 223,) by Mr. Bauer, that the real nature of this 

 curious matter was made out, and that it was shown to be a 

 fungus of the genus Uredo, In this paper Mr. Bauer details a 



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