Junk, 1020] MISCELLANEOUS 443 



3080, Vkudoorn', Inkz C. The genus Fagara as represented in the South African herbaria. 

 Jour. Botany 57: 201-20f). 1919.— A brief historical sketch is given at Fagara as a genus, and 

 its relation to Zanthoxyluni. Kngler reverted to the two Liniiean geneTfl afl distinct, and this 

 arrangement has been adopted by all subsequent authors. Harvey divides the South Af- 

 rican specimens into 2 species, while Sim reduces them to a single variable one. The present 

 rather gives 3 species, 1 of which, Fagara capensis Thunb., includes the 2 of Harvey, while 

 the other 2 are new. The new are F. Thorncroftii, Transvaal, and F. Davyi, Transvaal, 

 Swaziland, Zululand, and Transkei. — A'. M. Wiegand. 



3027. Weingart, Wilh. Die Bliite des Cereus aurivillus K. Sch. [The flower of Cereus 

 aurivillus K. Sch.] Monatsschr. Kakteenkunde 29: 6-10. / pi., 1 Jig. 1919.— The author 

 records the first description of the flower. The species belongs to Cleistocaclus Berger and 

 is related to C. Monvilleanus Weber and C. icosagonus P. DC. The honey chamber is de- 

 scribed and compared with that of C. colubrinus, another species of Cleistocaclus. — .1. .S'. 

 Hitchcock. 



302S. Weingart, W. Kleine mitteilungen. [Minor contributions.] Monatsschr. Kak- 

 teenkunde 29: 10. 1919.— (1) To avoid mistakes, the author states that, in his previous arti- 

 cle on Phyllocaclus chiapensis (Ibid. 28: 121. 1918), by "purple" he meant the color of 

 Cassius' gold-purple, and that the sepals should be described as narrowly triangular instead 

 of "spiessformig." (2) Spineless Opuniia obtained from Luther Burbank produced spines 

 at Erfurt. Spineless specimens of 0. ficus-indica from Sicily produced spines when grown at 

 Erfurt. The author thinks it doubtful if spineless forms should be recommended for fodder 

 on sterile soil. [See next following Entry, 3029.] — A. S. Hitchcock. 



3029. Weingart, W. Kleine Mitteilungen. [Minor contributions.] Monatsschr. Kak- 

 teenkunde 29: 18-19. 1919.— (1) Differences between Cereus Gonzalezii Web. and C. tinella 

 Web. are given. (2) Concerning Cereus acanthosphaera Wgt. (op. cit. 24: 83. 1914) the au- 

 thor adds that lenticels take the place of stomata. (3) Indigo in the parenchyma (op. cit. 

 84) was not demonstrable, the light blue tinge coming from the packing. (4) A previously 

 mentioned Cereus from Zacapa (Guatemala) is discussed (see op. cit. 26: 76. 1916). (5) 

 The author gives a note on Cereus rostratus Lem. (see op. cit. 19: 186. 1909). [See also next 

 preceding Entry, 3028.] — A. S. Hitchcock. 



MISCELLANEOUS, UNCLASSIFIED PUBLICATIONS 



Btjrton E. Livingston, Editor 



3030. Anonymous. Rubber substitute from German plants. Sci. Amer. Suppl. 87: 237. 

 1919. — The sap of certain Euphorbiaceae has been shown to contain a rubber-like constituent 

 which can be isolated. — Chas. H. Otis. 



3031. Anonymous. The vegetable oil industry of Japan. Sci. Amer. Suppl. 87: 229. 1919. 



3032. Anrep, A. Investigation of peat bogs in Canada. Jour. Amer. Peat Soc. 12: 84-88. 

 1919. — Ten bogs were investigated with a view to their utilization. Their combined area is 

 4902 acres. Their depth varies from 3 to 30 feet. Some of the peat in them is suitable for 

 fuel and some of it for litter. — George B. Rigg. 



3033. Barnard, Joseph E. The limits of microscopy. Jour. Roy. Microsc. Soc. 1919: 

 1-13. 1 fig. 1919. — It is shown that a clear conception of magnitudes involved and the rela- 

 tion of the microscopic resolution to wave-lengths of light and to molecular dimensions is 

 necessary. An object may be visible to the unaided eye, even though one of its dimensions 

 is far below the range of microscopic resolution. By the use of a solid cone of illumination 

 the structural elements of the order of 3m can be resolved apart, and by the use of oblique 

 light this interval can be halved. The resulting image bears only a quantitative relation 



