56 TRANSACTIONS OF ROYAL SCOTTISH ARBORICULTURAL SOCIETY 



Utilised in the shape of pit-wood, since the cutting of wood for 

 the collieries to the aforementioned specification would take up 

 the whole trunk of the tree and a considerable portion of the 

 branchwood. Pit-wood offers remarkable facilities for the dis- 

 posal of coppice-\vood, but we repeat what we have already said 

 concerning charcoal, that to ensure the most highly remunera- 

 tive results it is essential to avoid felling at 20 to 25 years' 

 growth, and to extend the felling rotation to 35 to 40 years' 

 growth. 



"The following resolutions were afterwards passed by the 

 Congress : — 



1. That the rotation of the crop, wherever the soil will 



permit, be extended from 35 to 40 years. 



2. That the French collieries be encouraged to make more 



use of hardwoods. 



3. That mining timber for export be favoured with special 



rates for long distance transport. 



4. That the collieries ought to consider the acceptance of 



mining timber in tree lengths." 



J. T. S. 



Poplars. 



Bulletin No. 5 of the Forestry Commission is devoted to 

 poplars. It is divided into five sections, each written by a 

 separate author, and includes fifty-five pages of print. The first 

 chapter, written by Professor A, Henry of Dublin, describes the 

 botanical characters of the genus Fopulus, and of fifteen of the 

 more important species and hybrids. There are useful diagrams 

 of the leaves and shoots, from which the different species may 

 be identified. Chapter ii., by Mr W. H. Guillebaud, of the 

 Forestry Commission, deals with the silviculture of the poplars. 

 The value of the various species for planting in this country is 

 discussed, and also the methods of raising poplars in nurseries, 

 the formation of plantations, and the subsequent tending of the 

 trees. Frequent reference is made to methods employed on the 

 Continent, and especially to current French practice. The 

 chapter also contains notes on the rate of growth of poplar 

 plantations in different parts of Great Britain. Dr J. M. Munro, 



