150 TRANSACTIONS OF ROVAL SCOTTISH ARBORICULTURAL SOCIETY. 



from ]Mr Munro| Ferguson of Novar and Eaith, M.P., who was 

 one of those who had much to do with the iuception of the 

 Exhibition. This collection included sections of young trees 

 damaged by animals and insects; specimens of the larvte of 

 various destructive insects; plants with roots showing the results 

 of vai'ious methods of transplanting; working plans and maps 

 of woods: a dresstd laich board, a dressed Scots fir board, and 

 several finished birch bobbins. 



From the Royal Scottish Arboricultural Society itself came a 

 very interesting contribution, in the shape of part of a collection 

 of 170 sections of the timber of British-grown trees and shrubs, 

 and a collection of 100 micro-photographic slides of plant-tissue, 

 highly magnified. These latter were the gift to the Society of 

 Mr D. F. Mackenzie,'Mortonhall, Edinburgh. Mr Charles Wood, 

 of the Fettercdirn estate office, a former student in the Agricultural 

 Department of Aberdeen University, sent microscopic slides of 

 British timber in longitudinal, tangential, and cross sections. 

 And specially noteworthy in,the photographic display were photo- 

 micrographs of British economic woods and exotic economic woods, 

 chiefly Indian, from Mr R. A. Robertson, of the Botanical Depart- 

 ment of the University, St Andrews, who had prepared them by 

 a special method invented by himself. Another equally attractive 

 exhibit came from the Natural History Department of the Aber- 

 deen University, which is presided over by Professor J. Arthur 

 Thomson. This illustrated the life-histories of certain injurious 

 and of certain useful insects, by specimens of the insects, the 

 larvae, and the eggs: and it showed the nature of the damage 

 which is done to timber and to leaves by the injurious class. 



The literature of forestry was represented by a valuable collec- 

 tion of books sent by Mr Alexander Robson, of Messrs W. Smith 

 and Son, seedsmen, Market Street, Aberdeen. 



From Lord Aberdeen's seat, Haddo House, Mr John Clark, 

 forester on the estate, and one of the local secretaries of the 

 Exhibition, forwarded numerous specimens of pines and firs ; of trees 

 and plants damaged by insects; a photograph showing the results 

 of pruning; a pot of three varieties of seedling beech, the fruit of 

 one parent tree; specimens of " heart-rot " in spruce, etc. In this 

 collection there was also shown a magnificent block of solid wood 

 {Pinus Douglasii) from a tree forty-five years old, grown at 

 Haddo House. Mr John Crozier, Durris, contributed, among 

 other interesting exhibits, cones collected on the estate of Durris 



