908 



published in lusect Life, vol. iv, ]». 10. As (he «;('ii<'ral result of the 

 iiivestigatioiis it appeared that w iiile " a number of species of hical uon 

 nui>ratory locusts had multiplied far beyond the noruuil point and hail 

 undoubtedly done more or less damage, and while swarms and isolated 

 individuals of the true Rocky ]\fountain locust had ap]ieared in a few 

 cases, the rex^orts as a whole had been greatly exaggerated.'' 



DIVISION OF FORESTRY. 

 Bulletin No. G. 



TI3IBER PHYSICS, PART 1, B. E. Feknow (pp. 02, platcs G, figs. 11).— 

 A notice of the introductory portion of this bulletin and an aceimnt of 

 the oi'gauization and methods of the inv»'stigatioii in progress in the 

 Division of Forestry was given in Experiment fStatiou liecord. vol. in, 

 p. 729. The renniining portions of the bulletin contain articles on the 

 scope and historical developnuMit of the science of timl)er physics, 

 including refei-ences to both l'hiroi)ean and American work; the 

 organization and methods of the timber examinations in the Division 

 of Forestry; work at the test laboratory at St. Louis, Missouri, by J. B_ 

 .lohnson; examination into the physical pr(»perties of test material, by 

 E. Koth; iustructi(»ns for the collection of test pieces of i>ines for 

 examination; forms Ibi' records; and illustrative records of tests. Among 

 the illustrations are plans of the testing laboratory at St. Louis and of 

 the testing machines. 



The subject nuitter comprised in Timber Physics is classitiedaslnjlows: 



I. — Wood stkuctuke ou xylotomy. 



(a) Esivrior form. 



Heif woultl b»' (l<'3ciil)L'(l tlif t'ui 111 (liviIoi>iiitiit ()(■ liinlM-r in tin- staudiiig 

 tre»', <lifl«'n'iitiatcil iuto root system, root i-ollar, liol<» or trunk crow n. branrbt-s, 

 twigs; relativf auiouiits olniattMial fiiruisbcd by cacb. 

 (fr) Iiitrriiir xlriirlitriil appcaidiin ; ditlVrrntiaf iun aiul arratigi-inont of grotqis of 

 titrnctural plcnuMits. 



Here woubl bi- ik'scribcd tlic gross structural fi-atures of tlio wood, the 

 distributiou and si/e of uirdullary ray.s, vessels, fibro-vasoular liundles, as 

 exhibited to the n.iki-d eye or under the magnifying glass ou tangential, 

 radial, and transverse seeticuis; the a]>|)earauee of the annual rings, their 

 size, regularity, <litlerentiatiou into summer and spring wood, and all distin- 

 guishing features due to the arraugeuieut and jirojiortiou of the tissues eoiu- 

 jiosing the wood. 

 (c) Miiixtr aniiltimy «»■ hhlohxiji; ditfereutiation and ariangemeut of structural 

 elements. 



Here the re\elatious ot' the niitM'osro|ie are reciuded, esjiecially the form, 

 diuiensious, and structure of the ditlerent kinds of cells, their arraugeuieut, 

 proptution, and relative importance in tlie resulting tissues. 

 (<0 Comparative classification of woods, according to stnutiiral features, 

 (t) Laws of wood yfowlh with reference to structural results. 



Discussion of the factors that influence the furmatiou of wood iu the stand- 

 ing tree. 

 (/) Jbnormal formations. 



Burls, bird's-eye, curly, wavy, aud other structural abnormities and their 

 causeti. 



