94 TRANSACTIONS OK KOYAL SCOTTISH ARBORICULTUKAL SOCIETY. 



forms a girdle round the outside. The origins of these groups 

 are usually small patches of "advance growth." Regeneration 

 operations are conducted over a whole compartment at one 

 time, and except for keeping the canopy closed on the west side 

 the groups are not arranged in any definite manner. In this 

 respect Dr Arnold, who has charge of this forest division, is 

 not a disciple of Wagner. Each compartment is regenerated 

 usually within two periods. Cleanings are commenced in the 

 young crop before the mother-trees are removed. 



Returns. — During the past 50 years the revenue of this forest 

 has steadily risen, largely as the result of the completion of a 

 splendid road system. The net return per acre and year 50 

 years ago was 23s., to-day this amounts to 50s. The increase 

 has not been obtained by trenching upon capital, since there 

 is a larger growing stock to-day than there was formerly. 

 The current annual increment per acre is 98 cubic feet, while 

 the final yield is 89-3 cubic feet per acre. 



Before returning to the town of Winterthur for lunch, a visit 

 was paid to a very old crop of spruce and silver fir in which 

 some of the stems were 180 to 200 years of age, 150 feet high, 

 and contained upwards of 700 cub. feet. In the afternoon the 

 party made a short tour, under the guidance of Dr Arnold, in 

 the Lindberg Forest. The return journey to Zurich was made 

 in the evening. 



ZURICH AND ADLISBERG. 



In the company of Dr Schinz and the city gardener an 

 inspection was made, on Saturday morning, of the gardens and 

 specimen trees, etc., at the Alpenquai. A very varied and inter- 

 esting collection of trees has been established here. Later a visit 

 was paid to the Botanic Gardens. 



In the afternoon, under the leadership of Professor Engler, 

 the party was conducted over the Forest Research Garden at 

 Adlisberg. The objects of maintaining the garden are as 

 follows: — (i) to supply the plants used in forestry, (2) to study 

 the early stages of the life histories of trees, (3) to supply material 

 for experiment in the forest, (4) to supply material for the School 

 of Forestry. The garden is 3! acres in extent, and occupies a 

 small plateau which overlooks the town of Ziirich. Careful 

 meteorological records are kept in the garden, and in addition 



