FORESTRY. 653 



left for jv period of 2 years in u steeping vat composed of liquid manure and 

 other miscellaneous decomposing substances. At the end of this period the 

 sleejiers treated with injectol were still in gocxl condition, while the others were 

 almost completely destroyed. Similar results were obtained with paving blocks. 

 Further experiments a^e now being carried on. 



Injectol is said to be a very thin dark-brown liquid of regular density 

 witn a degree of viscosity changing very little with atmospheric variations. 

 One of its principal advantages is said to be its penetration into certain woods 

 without any pressure. The time necessary for the pressure and the soaking 

 into wood of a given quantity of injectol is reported as considerably less than 

 for any other antiseptic liquid, including creosote. 



Camphor industry, J. H. Arnold (Dailif ConsiiUtr inul 'I'radc Rpts. [U. .S.], 

 1[I07, \o. 2920, PI). 8-10). — A brief review of the progress and extent of camphor 

 production in China, together with statistics of production in Japan. 



The camphor-producing districts in China are said to be confined at present 

 to the region along the Min River in P^'ukien Province, although the occurrence 

 of trees in other provinces is also noted. The development of the camphor 

 industry in China has made remarkable progress during the past few years, 

 largely, it is believe<l, l»ecause of Japanese initiative and tlie advancement iu 

 the price of camphor. Upward of 1.1()0,()(H) kin (1,407,000 lbs.) were exported 

 in 1906. At the present i-ate of production it is believed that the trees will be 

 capable of yielding material for but 4 or 5 years longer. 



Tables are given shoving the production of cami)hor and camphor oil in 

 Japan from 1904 to 1900, inclusive, as well as the value of camphor imported 

 into Japan during the past 6 years in the form of celluloid. The estimated pro- 

 duction of camphor for 1900 is approximately r»..540.32.5 lbs., and of camphor 

 oil 4,(»1(),812 lbs. The value of camphor imported in the form of celluloid in 

 the same year is given as .$407,424. The prcxluctive jtower of Japan and 

 Formosa combined is estiniatetl as .s.^>,212,o75') lbs. of camphor and 7."),(I01,2.50 

 lbs. of camphor oil. The monopoly bureau is encouraging the cultivation of 

 the trees with the view of maintaining the i)resent productive power. 



Caoutcliouc in French West Africa, Y. Henry (Le Caoutchouc dans 

 VAfriquc Occidcntale Francaise. Paris: Gouvt. Gen. Afrique Occident. Franc, 

 1906, pp. 230, pis. 16, figs. 9, map J, dgms. 8). — This work treats of the various 

 phases of the rubber industry in I'rench West Africa, including the liistory of 

 its exploitation in the different colonies prior to 1904. the total production and 

 commerce of French West African types of rul)ber iu the various European 

 markets, and an explanation and discussion of the laws adopted on February 1, 

 190.^). for the purp()se of regulating and improving the methods of exploitation 

 and preparation of rubber, togetlier with an account of the results obtained 

 after the law liad been in force for one year. 



The work is based on the author's personal observations and investigations, 

 together wltli information secured from official documents. The text is accom- 

 panied liy a map of the country and numerous illustrations and statistical tables. 



A journey through guayule land, H. C. Pearson {India Rubber World, 35 

 {1901), \<). 0. pp. 113-rn ; 36 {1901), No. 1, pp. 205-210, flgs. 26, map /).— This 

 is an account of the discovery and develoi)ment of the guayule rubber industry 

 in northern Mexico, including a description of the counti-y and the methods of 

 exploitation and pi'oduction of rul»ber, with descriiitions and illustrations of the 

 fa<'tories now in o])eration. 



Damaged rubber trees renewing themselves, F. M. Ryder {Mo. Consular 

 and Trade Rpts. [U. N. |, 1901, \o. 322, p. 163). — In this note the author states 

 that the trees in the Khiefields district of Nicaragua, which were believed to 

 have suffered considerably from the hurricane last fall, are renewing them- 



