PHOTOGRAMMETRIC ENGINEERING 
based on existing forest maps, with or with- 
out air cover. 
Forest maps were prepared by the Arundel 
method and Epidiascope, subsequently re- 
placed by slotted and Harvard 
Multiscope, when the latter became avail- 
able. For forests of low potential value, type 
boundaries were transferred by eye or by 
Sketchmaster to semi-controlled photo-mo- 
templets 
saics, to topographical one-mile-to-the-inch 
sheets or to topographical 20 chain-to-one- 
inch sheets. 
Computation of the Timber volume was 
based on the Hollerith system. Calculated re- 
sults were given as volumes per plot and 
average volume per acre for different tree 
species and forest types. Standard Volume 
Tables were used for this purpose. Additional 
detail collected within plots during the survey 
dealing with the occurrence of poles, seedlings 
soil, fire and logging history etc. 
lyzed and published later. 
The total cost (apparently including aerial 
photography) was on the average 7.8 d. per 
acre or 13.5 d. per 1,000 cu. ft. 
will be ana- 
SPECIAL REMARKS 
Recently the American Society of Photo- 
grammetry succeeded in publishing the MAx- 
UAL OF PHOTOGRAPHIC INTERPRETATION. This 
Dr. D. A. N. Cromer 
Timber Bureau 
Mr. R. G. Miller 
Overseas Surveys 
Mr. H. Reichardt 
ganization of UN 
Prof. J. H. C. Smith 
Forestry 
and the author of this report. 
Recently this working party was enlarged 
with a new member, whose name is: 
Ing. VI. Cermak 
publication can be considered as a counterpart 
of the existing MANUAL OF PHOTOGRAM- 
METRY, which has already been accepted as a 
standard publication of International value. 
In the new MANUAL oN PHOTOGRAPHIC IN- 
FERPRETATION, Chap. VII deals with special 
forestry problems. Taking into consideration 
the impressive list of forestry experts, who 
contributed to this chapter, no doubt can 
exist of the outstanding value of this work. 
After taking notice of the material treated, 
be that the 
problems discussed are mainly based on typi- 
the impression, however, must 
29 
Division of Forest Management, Forest and 
Forestry and Land Use Section, Directorate of 
Forestry Division, Food and Agriculture Or- 
The University of British Columbia, Fac. of 
Czechoslovak Academy of Agric. 
Sciences, Forest Research Inst. 
cal American and Canadian conditions. 
For countries where working conditions 
are quite different or where the application of 
aerial photography is in an early stage, the 
value of this chapter seems rather limited. It 
is also noted that the possibilities in the uses 
of aerial photography within the tropics has 
been omitted. Considering the fact that par- 
ticularly in these regions the value of aerial 
photography will certainly be increased in the 
future, a general discussion of interpretation 
problems in these regions would increase the 
value of this publication. 
Dealing with the possibilities of improving 
International relations in the field of aerial 
photography as applied to forestry, it will 
perhaps be important to draw attention to 
the following fact. Under the sponsorship of 
the president of Section 25 of LU.F.R.O. 
(Intern. Assoc. of Exp. Stations in Forestry), 
a special working party has been established 
"to study the use of aerial photographs in 
forest inventories and to recommend standard 
applications and techniques research in this 
field." The working party is under the chair- 
manship of Mr. R. C. Wilson, Forest Survey 
Branch, Division of 
search, U. S. Forest Service, Washington, 
USA. The members who were asked to join 
Forest Economics Re- 
this working party are: 
Canberra, Australia 
Tolworth, Surbiton (Surrey) 
England 
Viale delle Terme di Cara- 
calla, Rome 
Vancouver 8, B.C., Canada 
Michalska 24/11 
Czechoslovakia 
Bratislava 
The activity of the working party has so 
far been concentrated on a tentative working 
plan, drafted by the chairman and circulated 
to members for comments. The object Is to 
produce a final report to be submitted to the 
chairman of Sect. 25 of the I.U.F.R.O. In this 
report information and recommendations in 
respect of the application of aerial photogra 
phy will be given. Also a compilation or a 
recommendation for compilation of an Inter- 
aerial 
photography in forest inventory will be in 
national bibliography on the use of 
cluded together with a glossary of technical